Crossword Genius

Workhorse that's only part horse (4)

Ross

I believe the answer is:

mule

(Other definitions for mule that I've seen before include "Offspring of a donkey and a mare" , "Sterile offspring of donkey and horse" , "Crossbreed" , "Proverbially stubborn beast" , "Obstinate quadruped" .)

I've seen this clue in The New York Times.
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