Run off in compliance with the rules (5)
I believe the answer is:
legit
This clue might be a double definition.
'run off in compliance' is the first definition.
The definition suggests a singular noun which matches the answer.
'with the rules' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for legit that I've seen before include "Above board (abbr)" , "Genuine" , "Honest (abbr)" , "Quite proper" , "ok!" .)