Crossword Genius

Hole in the wall where you may pick up a check? (5)

Ross

I believe the answer is:

pobox

(Another definition for pobox that I've seen is " Numbered compartment for mail".)

I've seen this clue in the Universal.
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.