Attack on all sides (5)
I believe the answer is:
beset
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">attack on all sides</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 beset that I've seen before include "Assail (with problems?)" , "Hem in, surround" , "surrounded by hostile forces" , "Hem in, afflict" , "Invested" .)