Besiege (8)
I believe the answer is:
blockade
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">besiege</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that blockade is a type of besiege)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for blockade that I've seen before include "clampdown" , "The sealing off a place to prevent entry or exist" , "Besiege" , "Physical prevention of access" , "Seal off (a place)" .)