Mailbox hole (4)

I believe the answer is:

slot

(Other definitions for slot that I've seen before include "Scheduled time - hierarchical position" , "Space for inserting coin" , "Long narrow opening" , "Small opening, for a coin say" , "Narrow opening as in gaming machine" .)

I've seen this clue in the Newsday.

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.