Posh schoolboy Antoine corrected (7)
I believe the answer is:
etonian
'posh schoolboy' is the definition.
'etonian' can be an answer for 'schoolboy' (I've seen this before). I am unsure of the 'posh' bit.
'antoine corrected' is the wordplay.
'corrected' indicates an anagram.
'antoine' is an anagram of 'ETONIAN'.
Can you help me to learn more?
(Other definitions for etonian that I've seen before include "Relating to one particular school" , "English student" , "student in establishment?" , "One educated at famous public school" , "Public school kid" .)