Comment from appreciative tenant correctly expressed (6-7)
I believe the answer is:
letter-perfect
'correctly expressed' is the definition.
I don't understand how the remainder of the clue works.
(Other definitions for letter-perfect that I've seen before include "(Of an actor) having learnt a role exactly" , "Having one's part accurately memorised" , "Correct in every detail - ferret pelt etc (anag)" , "(Of actor) having part learnt exactly" , "(Of an actor) with part perfectly memorised" .)