Coral island beachwear, perhaps (6)

I believe the answer is:

bikini

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'coral island' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for bikini that I've seen before include "Skimpy bathing costume or Pacific atoll" , "Beach clothing" , "A small two -piece bathing costume" , "Small bathing costume or atoll in Marshall Islands" , "sparse cover?" .)

I've seen this clue in The Telegraph.

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