Put out to be used at a party (6)
I believe the answer is:
doused
'put out' is the definition.
(I've seen this before)
'used at a party' is the wordplay.
'at' is a charade indicator (letters next to each other) (I've seen this in other clues).
'a party' becomes 'do' (do is a kind of party).
'used' after 'do' is 'DOUSED'.
'to be' is the link.
(Other definitions for doused that I've seen before include "Plunged something into water or extinguished a fire" , "Drenched with liquid" , "Drenched, soaked" , "Extinguished or soaked" , "Extinguished, threw water over" .)