Crossword Genius

Somewhat asinine footwear? (5)

Ross

I believe the answer is:

mules

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'footwear?' is the definition.
(mules is a kind of footwear)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for mules that I've seen before include "Offspring of male donkeys and female horses" , "Stubborn horse-donkey animaly" , "Hybrid offsprings of a male donkey and a female horse" , "Obstinate people" , "Backless slippers" .)

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