A resume to reform the law (7)
I believe the answer is:
measure
'the law' is the definition.
(thesaurus)
'a resume to reform' is the wordplay.
'to reform' indicates an anagram (letters in a new form).
'a'+'resume'='aresume'
'aresume' anagrammed gives 'MEASURE'.
(Other definitions for measure that I've seen before include "Portion" , "See 6" , "The size of a dance" , "Take dimensions of" , "Get hands, perhaps" .)