The most common and most likely answer to this crossword clue is the 7 letter word TAXICAB
I've seen this crossword clue in The Guardian
T
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More clues leading to the result TAXICAB
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 = taxicab.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 TAXICAB mean?
TAXICAB noun- A vehicle that passengers hire to take them between locations of their choice, the fare being calculated with a taximeter; a taxi or cab
- To travel by taxicab.