The hosts were fully in control of the match for the opening 60 minutes, but allowed their opponents to snatch a try bonus point with two tries in the closing six minutes.
Cozens said: "It was great to win and we were dominant for the first 60 minutes.
"In games we have lost, we set the same early pattern and then managed to lose. We must learn to maintain concentration and continuity for the full 80 minutes.
"Clifton have the skills and determination, but we must retain the mental focus for the entire match.
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