School founded by Henry VI (4)
I believe the answer is:
eton
'school founded by henry vi' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eton that I've seen before include "Posh college" , "Town on the Thames noted for its school" , "Posh English school of note" , "Town opposite Windsor on the Thames" , "Public school near Windsor" .)