Perfect law that's been revoked (5)
I believe the answer is:
exact
I believe this is a double definition.
'perfect' is the first definition.
(similar in meaning)
'law that's been revoked' is the second definition.
(ex-act, a former legal act)
(Other definitions for exact that I've seen before include "Spot-on" , "Absolutely accurate or correct" , "Explicit" , "Strict" , "Specific" .)