He is teaching nothing other than the doctrine of the Council of Trent.
CHAPTER VIII. In what manner it is to be understood, that the impious is justified by faith, and gratuitously.
And whereas the Apostle saith, that man is justified by faith and freely, those words are to be understood in that sense which the perpetual consent of the Catholic Church hath held and expressed; to wit, that we are therefore said to be justified by faith, because faith is the beginning of human salvation, the foundation, and the root of all Justification; without which it is impossible to please God, and to come unto the fellowship of His sons: but we are therefore said to be justified freely, because that none of those things which precede justification-whether faith or works-merit the grace itself of justification. For, if it be a grace, it is not now by works, otherwise, as the same Apostle says, grace is no more grace.
St. Clement clearly repudiates the heretical notion that salvation is independent of works. Read chapters 34 and 35.
The good servant receives the bread of his labour with confidence; the lazy and slothful cannot look his employer in the face. It is requisite, therefore, that we be prompt in the practice of well-doing; for of Him are all things. And thus He forewarns us: Behold, the Lord [comes], and His reward is before His face, to render to every man according to his work. He exhorts us, therefore, with our whole heart to attend to this, that we be not lazy or slothful in any good work. Let our boasting and our confidence be in Him. Let us submit ourselves to His will. Let us consider the whole multitude of His angels, how they stand ever ready to minister to His will. For the Scripture says, Ten thousand times ten thousand stood around Him, and thousands of thousands ministered unto Him, Daniel 7:10 and cried, Holy, holy, holy, [is] the Lord of Sabaoth; the whole creation is full of His glory. Isaiah 6:3 And let us therefore, conscientiously gathering together in harmony, cry to Him earnestly, as with one mouth, that we may be made partakers of His great and glorious promises. For [the Scripture] says, Eye has not seen, nor ear heard, neither have entered into the heart of man, the things which He has prepared for them that wait for Him. 1 Corinthians 2:9
How blessed and wonderful, beloved, are the gifts of God! Life in immortality, splendour in righteousness, truth in perfect confidence, faith in assurance, self-control in holiness! And all these fall under the cognizance of our understandings [now]; what then shall those things be which are prepared for such as wait for Him? The Creator and Father of all worlds, the Most Holy, alone knows their amount and their beauty. Let us therefore earnestly strive to be found in the number of those that wait for Him, in order that we may share in His promised gifts. But how, beloved, shall this be done? If our understanding be fixed by faith towards God; if we earnestly seek the things which are pleasing and acceptable to Him; if we do the things which are in harmony with His blameless will; and if we follow the way of truth, casting away from us all unrighteousness and iniquity, along with all covetousness, strife, evil practices, deceit, whispering, and evil-speaking, all hatred of God, pride and haughtiness, vain glory and ambition. For they that do such things are hateful to God; and not only they that do them, but also those that take pleasure in them that do them. Romans 1:32 For the Scripture says, But to the sinner God said, Wherefore do you declare my statutes, and take my covenant into your mouth, seeing you hate instruction, and castest my words behind you? When you saw a thief, you consented with him, and made your portion with adulterers. Your mouth has abounded with wickedness, and your tongue contrived deceit. You sit, and speak against your brother; you slander your own mother's son. These things you have done, and I kept silence; you thought, wicked one, that I should be like to yourself. But I will reprove you, and set yourself before you. Consider now these things, you that forget God, lest He tear you in pieces, like a lion, and there be none to deliver. The sacrifice of praise will glorify me, and a way is there by which I will show him the salvation of God.
I don't see anything here about the forensic imputation of the alien righteousness of Christ.