Remains of a fire (5)

I think it could be either:

Which length description are you looking for?:

ash

'remains of a fire' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for ash that I've seen before include "Tree; burnt residue" , "Hard pale wood" , "Burnt remains; tree" , "Volcanic dust" , "Timber tree" .)

I've seen this clue in The Telegraph, The Guardian, The New York Times, The Mirror, the Family Time and The Sun.

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