Unruly crowds (4)
I believe the answer is:
mobs
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unruly crowds</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for mobs that I've seen before include "Disorderly crowds of people" , "Unruly crowds" , "riotous assemblies" .)