The most common and most likely answer to this crossword clue is the 10 letter word SADDLEBAGS
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result SADDLEBAGS
Buddy explains!
The straight part
We know that "Riding breeches? No, but riders do use them" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case riding breeches? no, but riders do use them = saddlebags.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SADDLEBAGS mean?
SADDLEBAGS noun- A covered pouch, usually one of a pair, laid across the back of a horse, donkey, or mule behind its saddle, or hanging over the rear wheel of a bicycle or motorcycle; often made of leather or (on a bicycle or motorcycle) a rigid material.
- (in the plural) Loose fatty flesh on a person's upper thighs or buttocks, that hangs like saddlebags.
- A style of house with two rooms separated by a small hall and open space.