Permission for time off (5)
I believe the answer is:
leave
I believe this clue is a double definition.
'permission' is the first definition.
(leave is permission or authorisation)
'time off' is the second definition.
(leave is a kind of time off)
'for' is the link.
(Other definitions for leave that I've seen before include "Green light" , "Time off, depart" , "Go away on holiday" , "Brexit's aim" , "Permission - time off" .)