Constant nuisance (4)
I believe the answer is:
bane
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">constant nuisance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for bane that I've seen before include "Affliction, cause of distress" , "Something causing misery or distress" , "Blight" , "scourge" , "it causes misery" .)