The most common and most likely answer to this crossword clue is the 9 letter word LIMOUSINE
I've seen this crossword clue in The Times
L
I
M
O
U
S
I
N
E
More clues leading to the result LIMOUSINE
- Car and cow collide finally
- Left one timid person squeezing in vehicle
- Echo behind cattle car
- Car not entirely unfashionable? Wrong in green
- Large car minus oil — engine’s head cracked
- Cyclops is on oxygen, next to American, in queue for Trump-style transport?
- Car to remain outside flash American home
- Row about Finnish wheeled vehicle
- Learner is not half timid type going around in mini? No!
- Lose Mini racing round hairpin bend in big car
Buddy explains!

The straight part
We know that "car" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case car = limousine.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 LIMOUSINE mean?
LIMOUSINE noun- An automobile body with seats and permanent top like a coupe, and with the top projecting over the driver and a projecting front.
- An automobile with such a body.
- A luxury sedan or saloon car, especially one with a lengthened wheelbase or driven by a chauffeur.
- An automobile for transportation to or from an airport, including sedans, vans, and buses.