War game confused inapt party (9)
I believe the answer is:
paintball
'war game' is the definition.
(war-like game)
'confused inapt party' is the wordplay.
'confused' indicates anagramming the letters.
'party' becomes 'ball' (ball is a kind of party).
'inapt' anagrammed gives 'paint'.
'paint'+'ball'='PAINTBALL'
(Other definitions for paintball that I've seen before include "simulated combat" , "messy game" , "Missile used in war games" , "war game" .)