Island in the Inner Hebrides, the 'birthplace of Christianity in Scotland' (4)

I believe the answer is:

iona

(Other definitions for iona that I've seen before include "Scottish land known for St Columba" , "Scottish island of ancient saints" , "island off Scotland" , "Saint Columba's isle" , "Isle of the Inner Hebrides, made famous by St Columba" .)

I've seen this clue in The Guardian.

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