Disruptive commotion (6)
I believe the answer is:
rumpus
'disruptive commotion' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for rumpus that I've seen before include "5a [BALLYHOO] involving noise" , "Row" , "Kerfuffle" , "Noisy, disruptive commotion" , "Hullabaloo" .)