Crossword Genius

Riders may use these riding breeches? (10)

Ross

I believe the answer is:

saddlebags

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'breeches?' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Perhaps there's an association between them I don't understand?

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

Can you help me to learn more?

I've seen this clue in The Times and The Sunday Times.
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