Crossword Genius

Common allergy trigger (4)

Ross

I believe the answer is:

dust

(Other definitions for dust that I've seen before include "Fine powdery material that can be blown about in the air" , "Microscopic particles in the air" , "Our mortal body" , "Fine dry powder" , "Do some housework - we all come to it!" .)

I've seen this clue in the King Feature Syndicate.
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