Some proclaim it a terrible copy (7)
I believe the answer is:
imitate
'copy' is the definition.
('imitate' can be a synonym of 'copy')
'some proclaim it a terrible' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'IMITATE' is hidden within 'proclaim it a terrible'.
(Other definitions for imitate that I've seen before include "I tame it (anag)" , "Reproduce" , "Copy (mannerisms)" , "Copy or mimic" , "Fake" .)