Conservative fool lives for drink (6)
I believe the answer is:
cassis
'for drink' is the definition.
(I've seen this before)
'conservative fool lives' is the wordplay.
'conservative' becomes 'C' (UK political abbreviation).
'fool' becomes 'ass' (both can mean a stupid person).
'lives' becomes 'is' ('be' can be a synonym of 'live').
'c'+'ass'+'is'='CASSIS'
(Other definitions for cassis that I've seen before include "Blackcurrant cordial" , "Blackcurrant syrup" , "French sweet blackcurrant liqueur" , "Syrupy blackcurrant liqueur" , "syrup drink" .)