The most common and most likely answer to this crossword clue is the 7 letter word CARAVAN
I've seen this crossword clue in The Daily Telegraph
C
A
R
A
V
A
N
More clues leading to the result CARAVAN
- Vehicle takes a run through county
- Vehicles catch a train
- A vehicle towed by another
- Trailer for vehicle
- A means of transport for gunmen in part of Ulster
- A Romany leader entering Irish county in a mobile home
- Without much travail, not prevented from moving home
- Vehicles crossing America in convoy
- Two vehicles sandwiching a third?
- One vehicle after another for group of travellers
Buddy explains!

The straight part
We know that "Two vehicles sandwiching a third?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case two vehicles sandwiching a third? = caravan.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 CARAVAN mean?
CARAVAN noun- A convoy or procession of travelers, their vehicles and cargo, and any pack animals, especially camels crossing a desert.
- A furnished vehicle towed behind a car, etc., and used as a dwelling when stationary.
- To travel in a caravan (procession).
- To travel and/or live in a caravan (vehicle).