Nocturnal insect (4)
I believe the answer is:
moth
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nocturnal insect</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for moth that I've seen before include "Night flier" , "Nocturnal winged insect" , "Night-flying insect" , "Insect attracted to light" , "Night-flier" .)