Alumnus feasted regularly, appearing thus? (5)

I believe the answer is:

obese

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'alumnus feasted regularly appearing thus?' is the definition.
I can't tell whether this defines the answer.

'alumnus feasted regularly appearing' is the wordplay.
'alumnus' becomes 'ob' (old boy).
'regularly appearing' means one should take alternating letters.
The alternating letters of 'feasted' are 'ese'.
'ob'+'ese'='OBESE'

Can you help me to learn more?

(Other definitions for obese that I've seen before include "Huge" , "Plump" , "round" , "with a pot?" , "Very big" .)

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