Clutching robe, seems fat (5)

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)

'clutching robe seems' is the wordplay.
'OBESE' is hidden within the letters.
But, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for obese that I've seen before include "getting well-upholstered" , "round" , "Unhealthily fat and overweight" , "Pathologically fat" , "Plump" .)

I've seen this clue in The Mirror.

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