Crossword Genius

Greasy fingerprint, maybe (6)

Ross

I believe the answer is:

smudge

(Other definitions for smudge that I've seen before include "Blur, smear" , "Messy smear caused by rubbing" , "Messy mark" , "blurred impression" , "Smeared blot" .)

I've seen this clue in the LA Times.
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