Somewhat ashen, natural dye (5)

I believe the answer is:

henna

'dye' is the definition.
(henna is a kind of dye)

'somewhat ashen natural' is the wordplay.
'somewhat' indicates a hidden word.
'HENNA' can be found hidden inside 'ashen natural'.

(Other definitions for henna that I've seen before include "hair colour?" , "shock treatment" , "Reddish-brown dye from shrub leaves" , "Reddish-brown plant dye" , "Skin and hair dye" .)

I've seen this clue in The Telegraph.

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