Greasy fingerprint, maybe (6)
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 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" .)