Hebridean isle and monastery site (4)

I believe the answer is:

iona

(Other definitions for iona that I've seen before include "Scottish island from where Christianity spread in 563 AD" , "Macbeth's resting" , "small island" , "St Columba's monastery isle" , "Isle of the Inner Hebrides, made famous by St Columba" .)

I've seen this clue in The Telegraph.

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