Punch, for the party (4)
I believe the answer is:
bash
I believe this clue is a double definition.
'punch' is the first definition.
(thesaurus)
'the party' is the second definition.
(bash is a kind of party)
'for' is the link.
(Other definitions for bash that I've seen before include "crash > party" , "Batter" , "Social event - clobber" , "Party; beat" , "Shindig, function" .)