Crossword Genius

Symbol of stubbornness (4)

Ross

I believe the answer is:

mule

'symbol of stubbornness' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for mule that I've seen before include "Drug courier; animal" , "Obstinate quadruped" , "The animal said to be stubborn" , "Obstinate person?" , "Hybrid beast" .)

I've seen this clue in the Newsday and the Universal.
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