Loud verbal attack (8)
I believe the answer is:
diatribe
'loud verbal attack' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for diatribe that I've seen before include "Bitter words" , "A prolonged piece of invective" , "Torrent of abuse" , "abusive outburst" , "provoking verbal onslaught" .)