Belligerent person (9)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">belligerent person</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 warmonger that I've seen before include "Aggressor" , "Hawk" , "Hitler, perhaps" , "Jingoistic individual" , "Jingoist" .)
(Other definitions for battler that I've seen before include "One struggling" , "Fighter" .)