Unruly mob (6)
I believe the answer is:
rabble
'unruly mob' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for rabble that I've seen before include "Person who stirs up feeling of mob" , "Person manipulating mob's passion" , "A disorderly crowd of unruly people" , "A mob of riffraff" , "Disorderly, loud crowd" .)