Vile, corrupt and immoral (4)
I believe the answer is:
evil
'immoral' is the definition.
('evil' can be similar in meaning to 'immoral')
'vile corrupt' is the wordplay.
'corrupt' indicates anagramming the letters.
'vile' is an anagram of 'EVIL'.
'and' is the link.
(Other definitions for evil that I've seen before include "Satanic" , "Moral depravity" , "Immorality" , "A live sort of badness" , "Profoundly immoral" .)