Violent racist reformed by Democrat (7)
I believe the answer is:
drastic
'violent' is the definition.
(I've seen this before)
'racist reformed by democrat' is the wordplay.
'reformed' indicates an anagram.
'by' is a charade indicator (letters next to each other).
'democrat' becomes 'd'.
'racist' is an anagram of 'rastic'.
'rastic' put after 'd' is 'DRASTIC'.
(Other definitions for drastic that I've seen before include "Severe and far-reaching" , "Severe, radical (measures)" , "Radical, brutal" , "Extreme - violent" , "Having strong effect" .)