Suburban Big Apple school (4)

I believe the answer is:

iona

(Other definitions for iona that I've seen before include "Isle of the Inner Hebrides, made famous by St Columba" , "small island" , "Hebridean island, where in 563 St Columba founded a monastery" , "monastic retreat" , "Island west of Mull" .)

I've seen this clue in the Newsday.

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