The most common and most likely answer to this crossword clue is the 9 letter word TAIWANESE
T
A
I
W
A
N
E
S
E
More clues leading to the result TAIWANESE
- Islanders unhappy deporting duke? Wait and see
- Islander treating wine as tea
- Twee Asian, eccentric island native
- Asian Democrats abandoning disastrous ‘Wait and See’
- Fish decline? BeNt set includes that islander
- Asian Spooner’s joints less sunburned?
- Asian that is outside declines to join army
- Sloth diminishes in those evacuated from an island nation
- People making new wine at sea
- Asian in Asia went off with European
Buddy explains!

The straight part
We know that "from an island nation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case from an island nation = taiwanese.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.