Seize wrongfully (5)
I believe the answer is:
usurp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">seize wrongfully</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 usurp that I've seen before include "Take (power) by force or illegally" , "Take (power etc) illegally" , "Seize without right" , "Take over - misappropriate" , "Seize, take over" .)