Crossword Genius

Its promoters will raise no obstacle of course (4,4)

Ross

I believe the answer is:

flat race

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'course' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for flat race that I've seen before include "event" , "The rush, of course" , "St Leger, for instance" , "Derby, for example" , "not hurdled" .)

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