Crossword Genius

Back muscle, informally (3)

Ross

I believe the answer is:

lat

(Another definition for lat that I've seen is " muscle".)

I've seen this clue in the Universal, the King Feature Syndicate and The New York Times.
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.