Scold harshly (6)
'scold harshly' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for berate that I've seen before include "Scold, castigate" , "Angrily scold/criticise" , "Rebuke" , "Rebate (anag.)" , "Have words with" .)
(Other definitions for lambaste that I've seen before include "Severely criticise" , "Batter - male bats (anag)" , "Beat -- reprimand severely" , "Censure severely or angrily" , "hit in a way that's hard to beat?" .)