Seize unlawfully (5)
I believe the answer is:
usurp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">seize unlawfully</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for usurp that I've seen before include "Wrongfully assume" , "Take over - misappropriate" , "Assume authority" , "Take power unlawfully" , "Take (power) by force or illegally" .)