Crossword Genius

Sterile offspring of a male donkey and a female horse (4)

Ross

I believe the answer is:

mule

(Other definitions for mule that I've seen before include "Backless slipper" , "footwear" , "Proverbially stubborn beast" , "Proverbially stubborn animal" , "Hybrid animal - slipper" .)

I've seen this clue in The Mirror.
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