Crossword Genius

Reasonable to run away (5)

Ross

I believe the answer is:

legit

I'm a little stuck... Click here to teach me more about this clue!

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for legit that I've seen before include "Briefly in accordance with law or rules" , "Authorised" , "Honest (abbr)" , "acceptable" , "Quite proper" .)

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