Not fine (6)
I believe the answer is:
coarse
'not fine' is the definition.
('coarse' is the opposite to 'fine')
This is all the clue.
(Other definitions for coarse that I've seen before include "Rude, vulgar" , "Rought or crude" , "lacking in taste" , "Rough to the touch or lacking refinement" , "Vulgar - unrefined" .)