Crossword Genius

Dirty mark (5)

Ross

I believe the answer is:

smear

(Other definitions for smear that I've seen before include "nasty mark" , "Discredit" , "material for examination that is on the slide" , "Greasy/sticky mark" , "Slander - tissue sample used for testing" .)

I've seen this clue in The Independent and The Telegraph.
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