Withdraw permission (5)
I believe the answer is:
leave
This clue is a double definition.
'withdraw' is the first definition.
(I've seen this before)
'permission' is the second definition.
(leave is permission or authorisation)
(Other definitions for leave that I've seen before include "Brexit's aim" , "Go (5)" , "Pull out" , "Depart, go" , "Time off, depart" .)