Crossword Genius

Unknown commenter, for short (4)

Ross

I believe the answer is:

anon

(Other definitions for anon that I've seen before include "Presently - unattributed" , "Soon; unattributed" , "Of unknown authorship" , "Incognito (abbrev)" , "Of unknown identity, in short" .)

I've seen this clue in the USA Today and the Universal.
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