Leave the vehicle burning (6)
I believe the answer is:
alight
'burning' is the definition.
(set alight)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for alight that I've seen before include "Descend from vehicle" , "Burning; get down" , "Land; burning" , "Disembark, land" , "(Of bird) settle" .)