Crossword Genius

Drunkard's insult? (4)

Ross

I believe the answer is:

slur

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This could be a double definition.

'drunkard's' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'insult?' is the second definition.
(I've seen this before)

Can you help me to learn more?

(Other definitions for slur that I've seen before include "Disparaging comment" , "Musical sign: "Run together"" , "Disparaging remark" , "Mumble words - it's an affront" , "Pronounce indistinctly with each sound running into the next" .)

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