Scroogean outburst (3)
I believe the answer is:
bah
'scroogean outburst' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bah that I've seen before include "Appalling!" , "Comic expression of contempt" , "Exclamation of contempt or disgust - Scrooge used to say it" , "Disbelieving expression" , "Exclamation of disgust or annoyance" .)