Run amok (4)
'run amok' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for riot that I've seen before include "Violent crowd disturbance" , "Disturbance of the peace by many" , "Rampage" , "Disturbance by unruly mob" , "Violent disturbance by mob" .)
'run amok' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rampage that I've seen before include "Rush around violently and uncontrollably" , "Rioting, for example" , "Map gear (anag.)" , "Fury" , "Destructive spree" .)