Wine about to get saint drunk (7)
I believe the answer is:
retsina
'wine' is the definition.
(type of Greek wine)
'about to get saint drunk' is the wordplay.
'about' becomes 're' (regarding).
'to get' says to put letters next to each other.
'drunk' indicates an anagram.
'saint' with letters rearranged gives 'tsina'.
're'+'tsina'='RETSINA'
(Other definitions for retsina that I've seen before include "Nastier (anag) - Greek wine" , "Greek resin-flavoured wine" , "Flavoured Greek white wine - nastier brand" , "Greek drink" , "Nastier (anag) - white (or rose) wine" .)