English fashion set by boy who has private education? (7)
I believe the answer is:
etonian
'who has private education?' is the definition.
(Eton College student)
'english fashion set by boy' is the wordplay.
'english' becomes 'e' (abbreviation).
'fashion' becomes 'ton' (I've seen this before).
'set by' means one lot of letters go next to another.
'boy' becomes 'ian' (**).
'e'+'ton'+'ian'='ETONIAN'
(Other definitions for etonian that I've seen before include "One educated at famous public school" , "Public schoolboy" , "Alumnus of famous English school" , "Public school boy" , "English student" .)