Shout from Scrooge (3)
I believe the answer is:
bah
'shout from scrooge' 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 "Expression of disgust or contempt" , "Disbelieving expression" , "''...! Humbug!'' (Scrooge)" , "Comic expression of contempt" , "Exclamation of contempt or disgust - Scrooge used to say it" .)