A quiet wood (3)

I believe the answer is:

ash

'wood' is the definition.
(wood from an ash tree)

'a quiet' is the wordplay.
'quiet' becomes 'sh' ('sh' is used to tell someone to be quiet).
'a'+'sh'='ASH'

(Other definitions for ash that I've seen before include "Tree; fire residue" , "Remains from the yule-log?" , "Burnt dust" , "Knotty - - (Ken Dodd)" , "Fire's remains" .)

I've seen this clue in The Times, The Globe and Mail, The Daily Mail and The Guardian.

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