Has permission to (3)
I believe the answer is:
may
'has permission to' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for may that I've seen before include "'5 _____' (popular piece of music by Bach)" , "Fifth month" , "Month; hawthorn" , "Has permission" , "Girl's name; 10 ac (anag.)" .)