The race to repair the track (5)

I believe the answer is:

relay

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'the race' is the definition.
(relay race)

I don't understand the remainder of the clue.

(Other definitions for relay that I've seen before include "article in bank" , "track event" , "Broadcast" , "supplementary store of anything" , "Hand, pass on" .)

I've seen this clue in the Evening Standard.

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