School near Windsor (4)
I believe the answer is:
eton
'school near windsor' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for eton that I've seen before include "English college of note" , "Collar - crop - jacket - school" , "Posh British public school" , "Kind of collar or jacket (worn at college?)" , "School; jacket type" .)