Severely reprimand (8)
I believe the answer is:
chastise
'severely reprimand' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for chastise that I've seen before include "Inflict physical corrective treatment" , "Beat" , "Whip perhaps" , "Castigate or punish" , "Censure severely" .)