This person's revolting (6)
I believe the answer is:
rioter
'this person's revolting' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rioter that I've seen before include "He's running amok in the street" , "He is taking part in a public affray" , "Disturber of the peace, looter" , "One of a violent crowd" , "One disturbing the peace" .)