Crossword Genius

Enormous old boy feasted regularly (5)

Ross

I believe the answer is:

obese

'enormous' is the definition.
(I've seen this before)

'old boy feasted regularly' is the wordplay.
'old boy' becomes 'OB' (abbreviation for a private school 'old boy').
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'feasted' are 'ese'.
'ob'+'ese'='OBESE'

(Other definitions for obese that I've seen before include "Pathologically fat" , "having generous corporation" , "Needing to lose weight" , "with a pot?" , "Enormous" .)

I've seen this clue in The Sun.
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