Cleared up stretch with races on? (4,5)
I believe the answer is:
dirt track
'cleared up stretch' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
'races on?' is the wordplay.
I cannot quite see how this works, but
'races' could be 'tt' (Isle of Man Tourist Trophy races) and 'tt' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'with' is the link.
Can you help me to learn more?
(Other definitions for dirt track that I've seen before include "Unpaved cycle-race course" , "Unmade road" , "Motorcycle race circuit" .)