Puts out for party purposes (6)
I believe the answer is:
douses
'puts out' is the definition.
(dousing is a kind of putting out)
'party purposes' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'purposes' becomes 'uses' ('use' can be a synonym of 'purpose').
'do'+'uses'='DOUSES'
'for' acts as a link.
(Other definitions for douses that I've seen before include "Drenches or extinguishes" , "wets" , "Dips into liquid or extinguishes a light" , "Dips into a liquid or puts out, a candle say" , "Puts out fire with water" .)