Putdown (4)
I believe the answer is:
slur
'putdown' 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 "Slight; blur" , "making indistinct sound" , "Disparage" , "Aspersion - speak indistinctly" , "Slight - incoherence in speech" .)