Permission not to interfere (5)
I believe the answer is:
leave
'permission' is the definition.
(leave is permission or authorisation)
I don't 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 "Relinquish - holiday" , "taken by those on the way out" , "Withdraw - permission - to go - holiday" , "Go - on holidays?" , "Pull out" .)