The most common and most likely answer to this crossword clue is the 5 letter word COACH
I've seen this crossword clue in Financial Times
C
O
A
C
H
More clues leading to the result COACH
- Transport for team's trainer
- Train or bus
- Train, or alternative form of transport?
- Greyhound, maybe, in care of a church
- Vehicle instructor
- Broken-down train not in? Almost everything about that’ll indicate variable units
- Train company – an endless pain
- Sleeper maybe in aft cabin on board
- Train – or part of one
- Train carriage
Buddy explains!

The straight part
We know that "Vehicle/instructor" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case vehicle/instructor = coach.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 COACH mean?
COACH noun- A wheeled vehicle, generally drawn by horse power.
- A passenger car, either drawn by a locomotive or part of a multiple unit.
- (originally Oxford University slang) A trainer or instructor.
- A single-decked long-distance, or privately hired, bus.
- The forward part of the cabin space under the poop deck of a sailing ship; the fore-cabin under the quarter deck.
- (chiefly US) The part of a commercial passenger airplane or train reserved for those paying the lower standard fares; the economy section.
- To train.
- To instruct; to train.
- To study under a tutor.
- To travel in a coach (sometimes coach it).
- To convey in a coach.