Footballers one urges to run faster? (5)

I believe the answer is:

spurs

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'footballers' is the definition.
Although both the answer and definition are plural nouns, I cannot see how they can define each other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for spurs that I've seen before include "One side of London" , "incentives" , "Goads" , "Kicks out" , "soccer team" .)

I've seen this clue in the Evening Standard.

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