Crossword Genius

Boys-only school since 1440 (4)

Ross

I believe the answer is:

eton

(Other definitions for eton that I've seen before include "Noted public school" , "Berkshire public school" , "British public school of note" , "Posh English school of note" , "Public school near Windsor" .)

I've seen this clue in The New York Times.
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