One politician obeying the law: that goes without saying (8)
I believe the answer is:
implicit
'one politician obeying the law that goes without saying' is the definition.
Both the definition and answer are adjectives. Perhaps there's an association between them I don't understand?
'one politician obeying the law' is the wordplay.
'one' becomes 'i' (Roman numeral).
'politician' becomes 'MP' (Member of Parliament).
'obeying the law' becomes 'licit' (I can't justify this - if you can you should believe this answer much more).
'i'+'mp'+'licit'='IMPLICIT'
Can you help me to learn more?
(Other definitions for implicit that I've seen before include "Taken for granted" , "Inferred" , "I clip Tim (anag.)" , "Assumed, not spelled out" , "Understood but not openly stated" .)