Flying pests (5)
I believe the answer is:
gnats
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">flying pests</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 gnats that I've seen before include "Small biting flies" , "Small insects" , "Midges" , "Swarming insects" .)