Slight speech problem (4)

I believe the answer is:

slur

I believe this is a double definition.

'slight' is the first definition.
(I've seen this before)

'speech problem' is the second definition.
(I've seen this in another clue)

(Other definitions for slur that I've seen before include "Discredit to one's reputation" , "Stigma" , "Slight - mumble" , "Slight - incoherence in speech" , "Negative comment" .)

I've seen this clue in The Times.

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