Crossword Genius

Robes expanding to disguise fat (5)

Ross

I believe the answer is:

obese

I'm a little stuck... Click here to teach me more about this clue!

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

'robes expanding to disguise' is the wordplay.
'OBESE' is hidden within the letters.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for obese that I've seen before include "Morbidly fat" , "Plump" , "Enormously portly" , "Having excessive girth" , "Carrying far too much weight" .)

I've seen this clue in The Sun and The Guardian.
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