Nobody warned Creole centrists on this island (6)

I believe the answer is:

borneo

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'this island' is the definition.
(Indonesian island)

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

(Other definitions for borneo that I've seen before include "The world's third-largest island" , "Oberon on the large Asian island" , "Oberon (anag) - island" , "Largest island of the Malay archipelago" , "Island in the western Pacific" .)

I've seen this clue in The Irish Times.

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