Antoine may be from a good school (7)
I believe the answer is:
etonian
'a good school' is the definition.
The definition suggests a singular noun which matches the answer.
'antoine may be' is the wordplay.
'may be' indicates anagramming the letters.
'antoine' is an anagram of 'ETONIAN'.
'from' is the link.
Can you help me to learn more?
(Other definitions for etonian that I've seen before include "Public school boy" , "Public schoolboy" , "Pupil at posh English school" , "Public school kid" , "Public school pupil" .)