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Beasts of burden (5)

Ross

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

I've seen this clue in the Penny Press, the Universal, The Mirror, The Star Tribune and The Guardian.
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