Annual US horse race for three-year-olds (8,5)

I believe the answer is:

kentucky derby

'annual us horse race for three-year-olds' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for kentucky derby that I've seen before include "Top US horse race" , "Annual US horse race for three-year-olds" .)

I've seen this clue in The Guardian.

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