Backless shoes (5)

I think it could be either:

Which length description are you looking for?:

mules

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

I've seen this clue in the Evening Standard and The Mirror.

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