Crossword Genius

Alma mater of three consecutive U.S. presidents (4)

Ross

I believe the answer is:

yale

(Other definitions for yale that I've seen before include "member of College League" , "Thief might gain entrance after picking this" , "University in USA" , "Member of the 11 - type of lock" , "US Ivy League college" .)

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