The most common and most likely answer to this crossword clue is the 7 letter word DOGCART
I've seen this crossword clue in The Guardian
D
O
G
C
A
R
T
More clues leading to the result DOGCART
Buddy explains!

The straight part
We know that "vehicle/vehicle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case vehicle/vehicle = dogcart.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 DOGCART mean?
DOGCART noun- A cart drawn by a dog.
- A two wheeled horse-drawn carriage with two transverse seats back to back. The rear seat originally closed up to form a box for carrying dogs.