Pester, nuisance (6)
I believe the answer is:
hassle
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">pester</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">nuisance</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for hassle that I've seen before include "Informally annoy or bother" , "Harass - grief" , "(Cause) stressful annoyance (to)" , "Annoy continually" , "Difficulty - dispute" .)