Demonstrate again, bringing rebuke (7)
I believe the answer is:
reprove
This clue is a double definition.
'demonstrate again' is the first definition.
('prove' is an answer for 'demonstrate' so perhaps 'reprove' is OK for 'demonstrate again')
'rebuke' is the second definition.
(I've seen this before)
'bringing' is the link.
(Other definitions for reprove that I've seen before include "Rebuke, censure" , "Admonish" , "Scold" , "Chide" , "carpet" .)