Vilify (6)
I believe the answer is:
revile
'vilify' is the definition.
(I know that vilify can be written as revile)
This is the entire clue.
(Other definitions for revile that I've seen before include "Vilify" , "Criticise - abuse" , "Upbraid, berate" , "Abusively criticise" , "Upbraid or abuse" .)