Crossword Genius

Wood stove output (3)

Ross

I think it could be either:

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3

4

ash

(Other definitions for ash that I've seen before include "Silvery-grey" , "... for this maybe" , "It no longer burns" , "Powdery residue from fire or cigarette" , "Oleaceous tree" .)

I've seen this clue in the USA Today.
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