Participate in yoga until thin (5)

I believe the answer is:

gaunt

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

'participate in yoga until' is the wordplay.
'participate in' indicates a hidden word (I've seen 'participating in' mean this).
'GAUNT' is hidden in the letters of 'yoga until'.

(Other definitions for gaunt that I've seen before include "Bleak" , "forlorn" , "Very thin, cadaverous" , "Very slight" , "Wasted" .)

I've seen this clue in The Irish Times.

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