Drinks provided in wild parties (9)
I believe the answer is:
aperitifs
'drinks' is the definition.
(aperitif is a kind of drink)
'provided in wild parties' is the wordplay.
'provided' becomes 'if' (eg 'provided it's sunny' means 'if it's sunny').
'in' means one lot of letters goes inside another.
'wild' indicates an anagram.
'parties' is an anagram of 'aperits'.
'if' put into 'aperits' is 'APERITIFS'.
(Other definitions for aperitifs that I've seen before include "Starters" , "Pre-dinner drinks" .)