Crossword Genius

Ink "oops"

Ross

I believe the answer is:

blot

(Other definitions for blot that I've seen before include "Soak up (ink); blemish" , "Ink stain; disgrace" , "stain on reputation" , "Stain left by spilled ink" , "Dark mark/stain" .)

I've seen this clue in The New York Times.
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