Permission to lead (2,5)
I believe the answer is:
go ahead
I believe this clue is a double definition.
'permission' is the first definition.
(I've seen this in another clue)
'lead' is the second definition.
(I've seen this before)
'to' acts as a link.
(Other definitions for go ahead that I've seen before include "Permission to proceed" , "Enterprisingly progressive" , "Signal to proceed" , "Up-and-coming -- authorisation" , "Ambitious" .)