Crossword Genius

Boy who's collared ain't one for caning (7)

Ross

I believe the answer is:

etonian

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'caning' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?

'boy who's collared ain't one' is the wordplay.
'ain't one' can be anagrammed to 'ETONIAN'.
Though, I am not clear how this is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for etonian that I've seen before include "student in establishment?" , "Public schoolboy" , "Public school pupil" , "Public school boy" , "Public school kid" .)

I've seen this clue in The Telegraph.
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