Boy who's collared ain't one for caning (7)
I believe the answer is:
etonian
'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" .)