A decent reform made law (7)
I believe the answer is:
enacted
'made law' is the definition.
(I've seen this before)
'a decent reform' is the wordplay.
'reform' indicates anagramming the letters (letters in a new form).
'a'+'decent'='adecent'
'adecent' with letters rearranged gives 'ENACTED'.
(Other definitions for enacted that I've seen before include "Passed legislation" , "A decent (anag.)" , "Performed as in a play, or passed into law" , "Made a bill into law" , "Represented" .)