The most common and most likely answer to this crossword clue is the 9 letter word HATCHBACK
I've seen this crossword clue in The Times
H
A
T
C
H
B
A
C
K
More clues leading to the result HATCHBACK
Buddy explains!

The straight part
We know that "vehicle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case vehicle = hatchback.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 HATCHBACK mean?
HATCHBACK noun- A car with a sloping, hinged rear door that opens upwards.
- The door itself.