To run away is quite legal, in short (5)

I believe the answer is:

legit

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'to run away' is the definition.
(as in 'leg it')

I can't explain the remainder of the clue.

(Other definitions for legit that I've seen before include "on the level" , "Quite proper" , "Authorised" , "Such theatre" , "Lawful, in short" .)

I've seen this clue in the Evening Standard.

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