Violent disturbance (4)
I believe the answer is:
riot
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">violent disturbance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(a riot is a disturbance or rebellion)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for riot that I've seen before include "loose living" , "A public affray or disturbance" , "Civil unrest" , "Civil disorder" , "A wild public affray" .)