Crossword Genius

Harvard University is the oldest in this group (3,6)

Ross

I believe the answer is:

ivy league

(Other definitions for ivy league that I've seen before include "academic grouping" , "Brown, Columbia, Cornell, Dartmouth, Harvard, Pennsylvania, Princeton and Yale" , "Harvard, Yale and six other private universities" , "Group of US universities of high prestige" , "Top US universities" .)

I've seen this clue in The Guardian.
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