Crossword Genius

Airborne irritant (4)

Ross

I believe the answer is:

gnat

'airborne irritant' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for gnat that I've seen before include "Stinging insect" , "Biting pest" , "a little bit of a nuisance" , "insect's" , "Small (swarming) fly" .)

I've seen this clue in The New York Times.
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