State of violent agitation (6)
I believe the answer is:
frenzy
'state of violent agitation' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for frenzy that I've seen before include "Period of wild behaviour" , "Violent excitement or agitation" , "Delirium - fury" , "Hysteria" , "State of excitement" .)