Crossword Genius

Former student given finally more Guinness double stout (5)

Ross

I believe the answer is:

obese

'stout' is the definition.
(both can mean overweight)

'former student given finally more guinness double' is the wordplay.
'former student' becomes 'OB' (abbreviation for 'Old Boy').
'given' is a charade indicator (letters next to each other).
'finally' suggests the final letters.
The final letters of 'more guinness double' are 'ese'.
'ob'+'ese'='OBESE'

(Other definitions for obese that I've seen before include "Very substantial" , "More than podgy" , "Unhealthily fat and overweight" , "Morbidly fat" , "Having excessive girth" .)

I've seen this clue in The Guardian.
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