Assert one's right to (5)
I believe the answer is:
claim
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">assert one's right to</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 claim that I've seen before include "Cause the loss of (a life)" , "Assertion; demand" , "Formal request" , "Maintain, assert" , "Assert; request" .)