Stop replying to, as on a 59-Across (5)

I believe the answer is:

ghost

(Other definitions for ghost that I've seen before include "suggestion" , "someone without much presence" , "Lay down life for another in this" , "author for someone" , "Supernatural apparition" .)

I've seen this clue in 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.