From diet here, always thin (8)

I believe the answer is:

ethereal

'thin' is the definition.
(thesaurus)

'from diet here always' is the wordplay.
'from' indicates the answer is hidden within the clue.
'ETHEREAL' can be found hidden inside 'diet here always'.

(Other definitions for ethereal that I've seen before include "Airy or supernatural" , "Celestial; insubstantial" , "Light, delicate, insubstantial" , "Airy, celestial" , "Impalpable" .)

I've seen this clue in The Telegraph.

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