A drink? A drunk earns it! (7)
I believe the answer is:
retsina
'a drink?' is the definition.
(retsina is a kind of drink)
'a drunk earns it' is the wordplay.
'a drunk' is an anagram indicator.
'earns'+'it'='earnsit'
'earnsit' anagrammed gives 'RETSINA'.
(Other definitions for retsina that I've seen before include "Greek resin-flavoured wine" , "Greek drink" , "S European wine" , "Oily-tasting Greek white wine" , "Greek wine - nastier sort" .)