Crossword Genius

Up to, informally (3)

Ross

I believe the answer is:

til

(Another definition for til that I've seen is " Sesame".)

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