Crossword Genius

Volcanic residue (3)

Ross

I believe the answer is:

ash

'volcanic residue' 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 "One [TYPE OF TREE]" , "Remnant from fire" , "Fraxinus" , "Tree in danger" , "Burnt remains; tree" .)

I've seen this clue in the LA Times, The Sun and the Universal.
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