Angry harangue (6)
I believe the answer is:
tirade
'angry harangue' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tirade that I've seen before include "A prolonged rant or harangue" , "A prolonged outburst of abuse" , "Prolonged abusive speech" , "Loud harangue" , "Long speech of angry criticism" .)