Surround with armed forces (7)
I believe the answer is:
besiege
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">surround with armed forces</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 besiege that I've seen before include "Surround (town etc) with armed forces" , "Surround (a stronghold)" , "Pester" , "Surround (a place) with hostile intent" , "Enclose, preventing ingress or egress" .)