Flanks (5)
I believe the answer is:
sides
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">flanks</span>' is the definition.<br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sides that I've seen before include "Sports teams" , "Opposing factions or facets" , "Opposing teams or facets" , "Angles" , "camps" .)