Belligerent, in British slang (5)
I believe the answer is:
aggro
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">belligerent in british slang</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for aggro that I've seen before include "Difficulties, trouble" , "Potential violence" , "Antisocial behaviour" , "belligerence" , "Violence - difficulties" .)