They're no longer burning to make tracks! (7)
I believe the answer is:
cinders
'tracks' is the definition.
The answer and definition can be both natural objects as well as being plural nouns.
Maybe there's a link between them I don't understand?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for cinders that I've seen before include "Embers" , "Pieces of partly burned coal" , "girl kept at home" .)