Crossword Genius

Incentive for a horse? (4)

Ross

I believe the answer is:

spur

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'incentive' is the definition.
(an incentive spurs someone on)

I can't explain the rest of the clue.

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(Other definitions for spur that I've seen before include "Sharply pointed projection" , "Sharp pointed projection" , "Goad - incentive" , "Strong incentive" , "Encourage" .)

I've seen this clue in The Mirror.
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