Upbraid (8)
'upbraid' is the definition.
(synonyms)
This is all the clue.
(Other definitions for reproach that I've seen before include "Scold(ing)" , "Rebuke or expression of disappointment" , "Upbraiding, censure" , "Blame, scold" , "Take to task" .)
'upbraid' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for chastise that I've seen before include "Inflict physical corrective treatment" , "Teach Sis to scold" , "Correct!" , "Severely reprimand" , "Reprimand, punish" .)