Burn up the track (6)
I believe the answer is:
scorch
'burn' is the definition.
(scorch is a kind of burn)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for scorch that I've seen before include "Burn; drive very fast (informal)" , "career" , "Get browned off" , "go very fast" , "Burn on the surfaces" .)