Lawful way to run off (5)
I believe the answer is:
legit
'lawful' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for legit that I've seen before include "Run away - above board (colloq)" , "not unlawful" , "allowed by law, shortly!" , "Authorised" , "Honest (abbr)" .)