Loud, crazy game (4)
I believe the answer is:
ludo
'game' is the definition.
(ludo is a board game)
'loud crazy' is the wordplay.
'crazy' indicates an anagram.
'loud' is an anagram of 'LUDO'.
(Other definitions for ludo that I've seen before include "race for four tokens" , "Loud sort of board game with dice and counters" , "Traditional board game" , "Simple board game, involving dice" , "Race game" .)