Crossword Genius

Frustrated; that's what a mule is (7)


I believe the answer is:


I'm a little stuck... Click here to teach me more about this clue!

'frustrated' is the definition.
('cross' can be a synonym of 'frustrate')

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for crossed that I've seen before include "Went over to the other side" , "Traversed" , "Intersected; opposed" , "Passed" , "Came over and < annoyed" .)

I've seen this clue in The Globe and Mail.
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.