Speak indistinctly (4)
'speak indistinctly' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for slur that I've seen before include "Discredit to one's reputation" , "Slight lack of distinction in speech" , "Discredit, say reputation" , "Defamation" , "Disparaging remark" .)
'speak indistinctly' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for mutter that I've seen before include "Talk indistinctly in a low voice - a German mother" , "Speak quietly and indistinctly" , "Grumble under one's breath" , "Barely audible utterance" , "carp, > grouse and > beef" .)