Crossword Genius

Man's riding garb (5)

Ross

I believe the answer is:

chaps

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'man's riding garb' is the definition.
I can't tell whether this definition defines the answer.

'man's riding garb' is the wordplay.
'man' becomes 'chap' (I've seen this in other clues).
'riding garb' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'chap'+'s'='CHAPS'

Can you help me to learn more?

(Other definitions for chaps that I've seen before include "providing leather bags from US" , "Cowboy's trousers; men" , "Guy's" , "Men; leather trousers" , "Cowboy leggings" .)

I've seen this clue in the Sydney Morning Herald.
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