Mutter angrily (7)
I believe the answer is:
grumble
(Other definitions for grumble that I've seen before include "Complain, protest" , "bitch" , "what Meldrew does" , "Express dissatisfaction" , "Grievance" .)
I believe the answer is:
grumble
(Other definitions for grumble that I've seen before include "Complain, protest" , "bitch" , "what Meldrew does" , "Express dissatisfaction" , "Grievance" .)