After taxes, party game! (7)
I believe the answer is:
netball
'game' is the definition.
(netball is a sport)
'after taxes party' is the wordplay.
'after taxes' becomes 'net' (as in net profits).
'party' becomes 'ball' (ball is a kind of party).
'net'+'ball'='NETBALL'
(Other definitions for netball that I've seen before include "After this, you get to serve again" , "activity no longer associated solely with girls" , "Team game, played mainly by women" , "Seven-a-side team game -- all bent (anag)" , "Sport whose players wear bibs" .)