Accident that can start a fire (5)
I believe the answer is:
spill
'accident' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for spill that I've seen before include "Thin piece of wood used to light a fire" , "Shed" , "Waste (liquid)" , "Cause liquid to overflow" , "Waste from container" .)