Crossword Genius

Is its offensiveness only slight? (4)

Ross

I believe the answer is:

slur

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'slight?' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

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(Other definitions for slur that I've seen before include "Pronounce indistinctly - discredit" , "Slight - smear" , "disgrace" , "Innuendo" , "Disparage" .)

I've seen this clue in the Evening Standard.
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