Pesky flying insect (4)
I believe the answer is:
gnat
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pesky flying insect</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 gnat that I've seen before include "Small (swarming) fly" , "Woodland area" , "insect's" , "mozzie" , "annoying flier" .)