Extra stout inside to be sensational (5)

I believe the answer is:

obese

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

'extra stout' is the definition.
'obese' can be an answer for 'stout' (both can mean overweight). I'm unsure of the 'extra' bit.

'inside to be sensational' is the wordplay.
'inside' indicates a hidden word.
'OBESE' is hidden within 'to be sensational'.

Can you help me to learn more?

(Other definitions for obese that I've seen before include "carrying remarkable weight" , "Needing to lose weight" , "Dangerously corpulent" , "Stout" , "having generous corporation" .)

I've seen this clue in The Sun.

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