Do well in good school (3,2)

I think it could be either:

get on

ger on

'do well' is the definition.

'good school' is the wordplay.
'good' becomes 'g' (abbreviation).
'school' becomes 'eton' (famous UK public school).
'g'+'eton'='GET ON'

'in' is the link.

(Other definitions for get on that I've seen before include "Enjoy harmonious relationship" , "Board - prosper" , "Make progress or mount up" , "Age; prosper" , "Make progress or advance in age" .)

I've seen this clue in The Times.

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