Crossword Genius

Greasy streak (5)

Ross

I believe the answer is:

smear

(Other definitions for smear that I've seen before include "Blur, smudge" , "unpleasant mark" , "Dirty mark; a libel" , "Slur - may be studied microscopically" , "material for examination that is on the slide" .)

I've seen this clue in The Star Tribune.
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