Archipelago component (4)

I believe the answer is:

isle

'archipelago component' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for isle that I've seen before include "Fair one is in shipping bulletin" , "It lies badly in water" , "being impossible without water" , "Eg, Sheppey" , "Man's one" .)

I've seen this clue in The New York Times and the Sydney Morning Herald.

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