Stream of invective (8)
I believe the answer is:
diatribe
'stream of invective' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for diatribe that I've seen before include "Stream of invective" , "A violent attack in words, abusive criticism" , "A prolonged tirade or abusive speech" , "'Abusive, bitter speech (8)'" , "slating" .)