Hex, jinx (5)
I believe the answer is:
curse
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">hex</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">jinx</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for curse that I've seen before include "Blasphemy" , "Execrate" , "Invocation of evil; swear" , "Evil spell - oath" , "Imprecation or oath" .)