Not fake or counterfeit (7)
I believe the answer is:
genuine
'not fake or counterfeit' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for genuine that I've seen before include "Not fake or counterfeit" , "Real, not faked" , "Ingenue - the real McCoy" , "Bona fide, authentic" , "Real; sincere" .)