Castigate, chastise (7)
I believe the answer is:
lambast
I believe this is a double definition.
'castigate' is the first definition.
(I know that castigate is a more specific form of the action lambast)
'chastise' is the second definition.
(I know that chastise is a more specific form of the action lambast)
(Other definitions for lambast that I've seen before include "Be harsh critic of" , "Reprimand" , "Beat severely" , "Criticise severely" , "rubbish" .)