Laugh-a-minute (4)
I believe the answer is:
riot
'laugh-a-minute' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for riot that I've seen before include "Uproar" , "Uprising" , "Lavish display (of colour)" , "Ruckus, insurrection" , "Violent disturnance of the peace (by crowd)" .)