Pronounce indistinctly (4)
I believe the answer is:
slur
'pronounce indistinctly' 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 "Insinuation, allegation" , "Disparagement" , "Defamation" , "Pronounce indistinctly or speak ill of" , "Slight lack of distinction in speech" .)