Vindicate (6)
I believe the answer is:
avenge
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vindicate</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 avenge that I've seen before include "Redress, vindicate" , "Retaliate on behalf of" , "Exact retribution, take satisfaction for injury" , "eg Nave (anag.)" , "Take satisfaction for injury received" .)