Archipelago components (7)
I believe the answer is:
islands
'archipelago components' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for islands that I've seen before include "Achill and Aran, say" , "Christmas and Easter are these" , "Eg The Balearics" , "Sin, lads, you're surrounded by water" , "Eg, Faroes" .)