One of "them" (3)
I believe the answer is:
foe
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">one of them</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 foe that I've seen before include "opposing side" , "Antagonist" , "Opponent" , "Evil rival" , "Am archaic enemy" .)