Strive, struggle (5)
I believe the answer is:
fight
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">strive</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">struggle</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that struggle can be written as fight)</span><br/ ><br/ ></span>
(Other definitions for fight that I've seen before include "Conflict" , "(Take part in) battle" , "Strive - struggle" , "Scrap" , "Contest" .)