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Beast of burden (5)

Ross

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5

6 9

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

I've seen this clue in the Evening Standard, The Daily Mail, The Mirror, The Telegraph and The Independent.
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