The most common and most likely answer to this crossword clue is the 7 letter word WAGONER
I've seen this crossword clue in The Sunday Telegraph
W
A
G
O
N
E
R
More clues leading to the result WAGONER
- Driver in West, a fellow doomed
- Trucker’s wife doomed?
- Vehicle's driver departed during conflict
- Carter’s wife doomed!
- Dead in conflict, he drove his chariot once
- Driver of vehicle disappeared in conflict
- Vehicle driver exhausted in fighting
- Driver missing in combat
- 2 securing old, old driver
- Teamster died in combat
Buddy explains!

The straight part
We know that "Vehicle driver" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case vehicle driver = wagoner.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 WAGONER mean?
WAGONER noun- Someone who drives a wagon.