Military (4)
I believe the answer is:
army
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">military</span>' is the definition.<br/ ><span class="explanation-format__explanation">(the armed forces)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for army that I've seen before include "Organisation for soldiering" , "Horde" , "Large military force" , "Fighting force" , "A defence force" .)