The most common and most likely answer to this crossword clue is the 6 letter word LANDAU
I've seen this crossword clue in The Guardian
L
A
N
D
A
U
More clues leading to the result LANDAU
- Get a posh carriage
- Carriage lined at the front with gold
- Secure gold carriage
- What carries passengers in Invercargill and Auckland
- Before university, acquire a coach
- Deliver gold in horse-drawn carriage
- Win gold for coach
- Estate car’s right-hand side gets clipped
- Vehicle boxed in by Opel and Audi
- Secure metal carriage
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 = landau.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 LANDAU mean?
LANDAU noun- A type of lightweight, four-wheeled carriage in which the front and back passenger seats face each other.
- (by extension) A style of automobile based around the design of landau carriages.