Permission to quit? (5)

I believe the answer is:

leave

I'm a little stuck... Click here to teach me more about this clue!

'permission' is the definition.
(leave is permission or authorisation)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for leave that I've seen before include "retire" , "Relinquish - holiday" , "Insufficient foliage" , "Permission to go; allow to remain" , "Green light" .)

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.