Permission to make tracks? (5)
I believe the answer is:
leave
I believe this clue is a double definition.
'permission' is the first definition.
(leave is a kind of permission)
'make tracks?' is the second definition.
'to' acts as a link.
(Other definitions for leave that I've seen before include "Green light" , "Go (5)" , "Don't touch" , "Withdraw - permission - to go - holiday" , "Pull out" .)