The most common and most likely answer to this crossword clue is the 4 letter word POLO
I've seen this crossword clue in The Guardian
P
O
L
O
More clues leading to the result POLO
- Game found by river — deep but not wide
- Cut back primarily on game
- Isolated inside pit with collar to wrap throat
- In Italian river, behold game
- Sport in Post Office, behold!
- Traveller in a VW
- Some interpol operations, one way or the other
- Work’s been mounted, look … as sport
- Number two crosses line ? game up!
- Escapologist’s distraction
Buddy explains!

The straight part
We know that "Traveller/a VW" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case traveller/a vw = polo.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 POLO mean?
POLO noun- A ball game where two teams of players on horseback use long-handled mallets to propel the ball along the ground and into their opponent's goal.
- The ice polo, one of the ancestors of ice hockey; a similar game played on the ice, or on a prepared floor, by players wearing skates.
- A polo shirt.
- A Spanish gypsy dance characterized by energetic movements of the body while the feet merely shuffle or glide, with unison singing and rhythmic clapping of hands.
- A dress shirt.