Extra stout? (5)

I believe the answer is:

obese

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This could be a double definition.

'extra' is the first definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

'stout?' is the second definition.
(I've seen this in another clue)

Can you help me to learn more?

(Other definitions for obese that I've seen before include "Unhealthily fat and overweight" , "Roly-poly" , "Enormous" , "Falstaffian" , "Grossly overweight" .)

I've seen this clue in The Sun.

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