The most common and most likely answer to this crossword clue is the 6 letter word NATANT
I've seen this crossword clue in Financial Times
N
A
T
A
N
T
More clues leading to the result NATANT
- Swimming gives you that tan repeatedly
- Nathaniel retains sunburn when floating
- Swimming, what a holiday-maker seeks in part of Australia
- Swimming in Mediterranean at Antibes
- What bather wants again revolves around swimming
- Swimming on a regular basis infant gains time
- Swimming creates fantastic tans
- Floating insect behind the brown counter
- Sodium to contaminate? Not one floating
- Book by soldier covering introduction to artistic swimming
Buddy explains!

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 NATANT mean?
NATANT adjective- Floating or swimming (in water)
- In a horizontal position, as if swimming