Crossword Genius

Posh pupil in at one after correction (7)

Ross

I believe the answer is:

etonian

I'm a little stuck... Click here to teach me more about this clue!

'posh pupil' is the definition.
'etonian' can be an answer for 'pupil' (I've seen this before). I am not sure about the 'posh' bit.

'in at one after correction' is the wordplay.
'after' is a charade indicator (letters next to each other).
'correction' is an anagram indicator (I've seen this in other clues).
'in'+'at'+'one'='inatone'
'inatone' with letters rearranged gives 'ETONIAN'.

Can you help me to learn more?

(Other definitions for etonian that I've seen before include "Public school kid" , "Relating to one particular school" , "student in establishment?" , "Pupil at posh English school" , "Alumnus of famous English school" .)

I've seen this clue in The Sun.
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