Collegiate rival of Rider (4)

I believe the answer is:

iona

(Other definitions for iona that I've seen before include "St Columba's monastery isle" , "Hebridean island famed for St Columba" , "holy site" , "'Hebridean island, early centre of Celtic Christianity (4)'" , "St Columba monastery isle near Mull" .)

I've seen this clue in The Washington Post.

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