Irritate, worry (3)
I believe the answer is:
vex
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">irritate</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that irritate can be written as vex)</span><br/ ><br/ >'<span class="explanation-format__original">worry</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that worry can be written as vex)</span><br/ ><br/ ></span>
(Other definitions for vex that I've seen before include "upset" , "Irritate, annoy" , "Irk" .)