Stubborn jerk (3)

I believe the answer is:

ass

(Other definitions for ass that I've seen before include "Animal related to horses" , "Stupid fellow" , "Idiotic animal" , "Horse hybrid" , "animal inside" .)

I've seen this clue in the USA Today.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.