Vibrant iguana sheltering somewhere in the Caribbean (7)

I believe the answer is:

antigua

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'somewhere in the caribbean' is the definition.
I can't tell whether this defines the answer.

'vibrant iguana sheltering' is the wordplay.
'sheltering' says the answer is hidden in the clue.
'ANTIGUA' is hidden in the letters of 'vibrant iguana'.

Can you help me to learn more?

(Other definitions for antigua that I've seen before include "Aga unit in the West Indies" , "former British possession" , "Caribbean island linked with Barbuda" , "Largest of Leeward Is." , "One of the Leeward Islands" .)

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