Left party after United game (4)
I believe the answer is:
ludo
'game' is the definition.
(ludo is a kind of game)
'left party after united' is the wordplay.
'left' becomes 'l' (common abbreviation).
'party' becomes 'do' (do is a kind of party**).
'after' is a charade indicator (letters next to each other).
'united' becomes 'u'.
'do' put after 'u' is 'udo'.
'l'+'udo'='LUDO'
(Other definitions for ludo that I've seen before include "Race game" , "Simple board game, involving dice" , "Game (meaning 'I play' in Latin)" , "Children's board game" , "race for four tokens" .)