Greek wine flavoured with resin (7)
I believe the answer is:
retsina
'greek wine flavoured with resin' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for retsina that I've seen before include "Greek wine - nastier sort" , "Nastier (anag) - Greek wine" , "Greek resin-flavoured wine" , "Greek white wine flavoured with resin" , "Greek drink" .)