A road not made for racing? (4,5)

I believe the answer is:

dirt track

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'a road' is the definition.
(I have seen 'Unmade road' mean 'dirt track' so perhaps 'road' could also mean 'dirt track')

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for dirt track that I've seen before include "Unpaved cycle-race course" , "Motorcycle race circuit" , "Unmade road" .)

I've seen this clue in The Globe and Mail.

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