I slipped around entrance to race track (5)

I believe the answer is:

spoor

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'track' is the definition.
(spoor is a kind of track)

I cannot understand how the remainder of the clue works.

(Other definitions for spoor that I've seen before include "Track of wild animal" , "24 [TRAIL]" , "Animal track or scent" , "Beast's trail" , "Animal track, trail" .)

I've seen this clue in The Telegraph.

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