Taste of claret's in another drink (7)
I believe the answer is:
retsina
'drink' is the definition.
(retsina is a kind of drink)
'taste of claret's in another' is the wordplay.
'taste of' indicates the answer is hidden within the clue.
'RETSINA' can be found hidden inside 'clarets in another'.
(Other definitions for retsina that I've seen before include "Oily-tasting Greek white wine" , "Greek resin-flavoured wine" , "Nastier (anag) - Greek wine" , "S European wine" , "Flavoured Greek white wine - nastier brand" .)