The most common and most likely answer to this crossword clue is the 6 letter word BIKINI
I've seen this crossword clue in Financial Times
B
I
K
I
N
I
More clues leading to the result BIKINI
- Black ones containing family’s swimwear
- Two-piece or two wheels, not quite in one
- British family wearing team’s beachwear
- Cycling mostly with Matilda in minimal attire
- . Riding limited on island – it covers top and bottom only
- Not much on? Take a ride briefly in island
- Cycling minibike, removing outer layer, revealing swimsuit
- Atoll where one pursues lovingly flexible relations
- Two-part coverage of British couple stopped by relatives
- Black family in team
Buddy explains!

The straight part
We know that "Pacific island/in which one may be found sunbathing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pacific island/in which one may be found sunbathing = bikini.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.
What does BIKINI mean?
BIKINI noun- A brief two-piece bathing suit worn by women, especially one that exposes the midriff and navel.
- A brief bathing suit worn by men.