Give up or renounce the throne (8)
I believe the answer is:
abdicate
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">give up</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(abdicating is a kind of giving up)</span><br/ ><br/ >'<span class="explanation-format__original">renounce the throne</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for abdicate that I've seen before include "Give up rule" , "Give up power" , "Leave throne" , "Give up a throne" , "Abandon" .)