Crossword Genius

Unsubstantiated accusation, usually (5)

Ross

I believe the answer is:

smear

(Other definitions for smear that I've seen before include "Dirty mark; aspersion" , "Dirty mark; a libel" , "Greasy/sticky mark" , "Spread dirty substance, try to damage reputation" , "allegation" .)

I've seen this clue in The Washington Post.
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