The most common and most likely answer to this crossword clue is the 11 letter word WHEELBARROW
I've seen this crossword clue in The Daily Telegraph
W
H
E
E
L
B
A
R
R
O
W
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 = wheelbarrow.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 WHEELBARROW mean?
WHEELBARROW noun- A small, one-wheeled (rarely two-wheeled) cart with handles at one end for transporting small loads.
- To convey in a wheelbarrow.
- To cause the weight of an aeroplane to become concentrated around the nosewheel.