Rioter gets run in in a riot (9)
I believe the answer is:
insurgent
'rioter' is the definition.
(thesaurus)
'gets run in in a riot' is the wordplay.
'in a riot' indicates anagramming the letters.
'gets'+'run'+'in'='getsrunin'
'getsrunin' anagrammed gives 'INSURGENT'.
(Other definitions for insurgent that I've seen before include "rising" , "Rebel, revolutionary" , "Revolting" , "freedom fighter" , "Unresting like a rebel" .)