Scrooge's scoff (3)
I believe the answer is:
bah
'scrooge's scoff' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bah that I've seen before include "''...! Humbug!'' (Scrooge)" , "Exclamation of disgust or annoyance" , "Appalling!" , "Comic expression of contempt" , "Disbelieving expression" .)