Crossword Genius

Is it worn by the rider when shin-kicking? (7,6)

Ross

I believe the answer is:

hacking jacket

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'it worn by the rider when shin-kicking?' is the definition.
The definition suggests a singular noun which matches the answer.

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

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(Another definition for hacking jacket that I've seen is " Riding garment".)

I've seen this clue in The Irish News.
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