Crossword Genius

Stubbornness symbols (5)

Ross

I believe the answer is:

mules

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

I've seen this clue in the Universal.
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