Enraged, demanded reform (8)
I believe the answer is:
maddened
'enraged' is the definition.
(I know that enraged can be written as maddened)
'demanded reform' is the wordplay.
'reform' is an anagram indicator (letters in a new form).
'demanded' is an anagram of 'MADDENED'.
(Other definitions for maddened that I've seen before include "Driven insane, enraged" , "Demanded, being enraged" , "Angered, enraged" , "Demanded to be driven insane" .)