Beat, prevail over (6)
I believe the answer is:
defeat
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">beat</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">prevail over</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for defeat that I've seen before include "Trounce, beat" , "Rout" , "Beat (an opponent)" , "Beat, win against" , "Opposite of victory" .)