Openers for Caribbean islands (4)
I believe the answer is:
keys
'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" .)