Crossword Genius

Openers for Caribbean islands (4)

Ross

I believe the answer is:

keys

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

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for keys that I've seen before include "Low-lying Caribbean islands" , "Musical scales" , "'Unlockers'" , "Lock-openers?" , "Lower House of the Isle of Man parliament" .)

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