Mumble (4)
'mumble' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for slur that I've seen before include "Discredit, say reputation" , "Slight sound" , "disgrace" , "Contentious allegation" , "Pronounce indistinctly or speak ill of" .)
'mumble' is the definition.
(I know that mumble can be written as mutter)
This is all the clue.
(Other definitions for mutter that I've seen before include "Grumble in secret; mother (German)" , "German violinist" , "Grumble under one's breath" , "Talk under one's breath" , "Lack of energy" .)