Crime of corrupt senator (7)
I believe the answer is:
treason
'crime' is the definition.
(I know that treason is a type of crime)
'corrupt senator' is the wordplay.
'corrupt' is an anagram indicator (a corrupted spelling of the word).
'senator' is an anagram of 'TREASON'.
'of' is the link.
(Other definitions for treason that I've seen before include "rebellion" , "Deliberate act of betrayal" , "Betraying one's country" , "Crime of national betrayal" , "Stare on (anag.)" .)