Crossword Genius

Whence subway air (5)

Ross

I believe the answer is:

grate

(Other definitions for grate that I've seen before include "Grind (cheese)" , "Grind, rasp" , "Rasp; shred" , "Reduce to small shreds" , "Irritate - rasp - fireplace" .)

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