largest Caribbean island (4)

I believe the answer is:

cuba

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

This is the entire clue.

(Other definitions for cuba that I've seen before include "Large island discovered by Columbus, 1492" , "Island nation" , "Its capital is Havana" , "Caribbean island republic" , "Guantanamo Bay island" .)

I've seen this clue in The Times.

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