Skeletal (4)

I think it could be either:

thin

bony

'skeletal' is the definition.
(similar in meaning)

This is all the clue.

(Other definitions for thin that I've seen before include "Flimsy" , "Made of light material" , "Dilute; lean" , "(Of smile) weak, forced" , "Lean; narrow" .)

I've seen this clue in The Telegraph, the Universal and the King Feature Syndicate.

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