Archipelago makeup (5)
I believe the answer is:
isles
'archipelago makeup' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for isles that I've seen before include "eg The Hebrides" , "- - of Scilly" , "British locations, say?" , "eg the Scillies" , "The Hebrides for instance" .)