The most common and most likely answer to this crossword clue is the 3 plus 3 letter word JET SKI
I've seen this crossword clue in The Guardian
J
E
T
S
K
I
More clues leading to the result JET SKI
- One skims the drink: Black Russian, amusingly?
- Vehicle, facetiously a Russian plane?
- A hazard to swimmers in Skopje? Tsk! Infuriating!
- Either side of Channel I voiced disapproval aboard water vehicle
- Craft stones: half a smacker
- One skimming over the water for black Russian?
- Two jumps, neither fully reaching water craft
- Craft centre in Stockport where postman delivers after spring
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 JET SKI mean?
JET SKI noun- A powered watercraft with a seat and handlebars in a style similar to a motorbike.