Any sneeze-causing substance (8)

I believe the answer is:

allergen

(Other definitions for allergen that I've seen before include "One provokes a reaction" , "Wheat, say" , "Irritant" , "Substance causing bodily reaction" , "Protein" .)

I've seen this clue in the Newsday.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.