Image of veneration like Iona’s centres (4)
I believe the answer is:
ikon
'image' is the definition.
(I know that image can be written as ikon)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for ikon that I've seen before include "Religious painting" , "Devotional painting in Eastern Churches" , "Revered image" .)