The most common and most likely answer to this crossword clue is the 8 letter word ANTIGUAN
I've seen this crossword clue in The Guardian
A
N
T
I
G
U
A
N
More clues leading to the result ANTIGUAN
- Islander who’s opposed to tagging noisy bird
- Island resident against weaponry is penning article
- Islander protesting at endless filth?
- Islander active in opposing the Second Amendment?
- Against taking game bird on Caribbean island
- Islander trapped by giant iguana
- Two animals, one tailless, one living on island
- West Indian not favouring endless natural fertiliser
- Opponent with weapon trapping a West Indian
Buddy explains!
The straight part
We know that "on Caribbean island" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case on caribbean island = antiguan.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.