Greek wine among clarets in Alsace (7)
I believe the answer is:
retsina
'greek wine' is the definition.
(I've seen this in another clue)
'among clarets in alsace' is the wordplay.
'among' indicates a hidden word.
'RETSINA' is hidden within 'clarets in alsace'.
(Other definitions for retsina that I've seen before include "Nastier (anag) - white (or rose) wine" , "Oily-tasting Greek white wine" , "Greek resin-flavoured wine" , "Flavoured Greek white wine - nastier brand" , "Greek drink" .)