Batter needed for party (4)
I believe the answer is:
bash
I believe this is a double definition.
'batter' is the first definition.
(I know that batter can be written as bash)
'for party' is the second definition.
(term for a party or celebration)
'needed' is the link.
(Other definitions for bash that I've seen before include "Party (colloq.)" , "Party; attempt (slang)" , "Hit hard; party (slang)" , "Smite; a party" , "Party - whack" .)