The most common and most likely answer to this crossword clue is the 5 letter word MOTOR
I've seen this crossword clue in The Daily Telegraph
M
O
T
O
R
More clues leading to the result MOTOR
- Drive second to right
- Trucker initially comes in to secure vehicle
- Doctor has to run a car?
- Space to reverse round front of traction engine
- Car close to kaput, having got stuck in heath
- Tense, entering space, backing car
- Drive doctor to river
- What one must pass before drive
- In the end, nut goes in to secure wheels
- Travel a short time to a river
Buddy explains!

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 MOTOR mean?
MOTOR noun- A machine or device that converts other energy forms into mechanical energy, or imparts motion.
- A motor car, or automobile.
- A source of power for something; an inspiration; a driving force.
- Any protein capable of converting chemical energy into mechanical work.
- The controller or prime mover of the universe; God.
- The fermenting mass of fruit that is the basis of pruno, or "prison wine".
- To make a journey by motor vehicle; to drive.
- To move at a brisk pace.
- To leave.
- Relating to the ability to move
- Relating to motor cars
- Propelled by an internal combustion engine (as opposed to a steam engine or turbine).