Accept an extension (6)

I believe the answer is:

resign

(Other definitions for resign that I've seen before include "Give up one's post" , "Give up position" , "Leave office voluntarily" , "Turn over" , "admit defeat" .)

I've seen this clue in the LA 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.