Surmount or defeat (7)
I believe the answer is:
conquer
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">surmount</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">defeat</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(to conquer is to defeat or beat)</span><br/ ><br/ ></span>
(Other definitions for conquer that I've seen before include "Miss Hardcastle stoops to" , "Win by force" , "Crush" , "Triumph over" , "Take possession of a territory by force" .)