Traduce (6)
I believe the answer is:
malign
'traduce' is the definition.
(I know that traduce can be written as malign)
This is the entire clue.
(Other definitions for malign that I've seen before include "Calumniate" , "Harmful, not benign" , "Of ill intent" , "Laming in harmful way" , "Speak bad of" .)