Hold out against (6)
I believe the answer is:
resist
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hold out against</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for resist that I've seen before include "Stand firm against" , "Forgo" , "Use force to prevent something from happening to sister" , "Stand up to, fight against" , "Put up fight, oppose forcefully" .)