Crossword Genius

Volcanic debris (3)

Ross

I believe the answer is:

ash

'volcanic debris' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ash that I've seen before include "Dusty residue of a fire" , "Residue of burnt matter" , "Silvery-grey" , "Timber tree" , "Hardwood" .)

I've seen this clue in The New York Times, the LA Times and the USA Today.
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