Belligerence (10)
I believe the answer is:
aggression
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">belligerence</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for aggression that I've seen before include "warlike attitude" , "Belligerence -hostility" , "Violent hostility" , "Act of hostility" , "Use of armed force" .)