Authority's abuse of freedom (7)
I believe the answer is:
licence
This might be a double definition.
'authority's' is the first definition.
(thesaurus)
'abuse of freedom' is the second definition.
'licence' can be an answer for 'freedom' (licence is a kind of freedom). I'm unsure of the 'abuse of' bit.
Can you help me to learn more?
(Other definitions for licence that I've seen before include "Freedom of action" , "Permit - freedom" , "What a driver needs" , "See 1" , "the green light" .)