Small island in the Inner Hebrides on which St Columba founded a monastery in 563 (4)

I believe the answer is:

iona

(Other definitions for iona that I've seen before include "Inner Hebridean island" , "Isolated part of UK" , "Site of St Columba's monastery" , "'Hebridean island, early centre of Celtic Christianity (4)'" , "Macbeth's resting" .)

I've seen this clue in The Independent.

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