Speak as if drunk (4)
I believe the answer is:
slur
'speak as if drunk' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for slur that I've seen before include "Pronounce indistinctly or smear" , "disgrace" , "Slight - incoherence in speech" , "Musical sign: "Run together"" , "Pronounce indistinctly or speak ill of" .)