Vex, annoy (3)
I believe the answer is:
irk
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">vex</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">annoy</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for irk that I've seen before include "Severely annoy" , "upset" , "Annoy in quirky way" , "Wind up" , "Bug" .)