Crossword Genius

Come clean, with "up" (4)

Ross

I believe the answer is:

fess

'come clean with up' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for fess that I've seen before include "Ordinary" , "Own up to crime" .)

I've seen this clue in The Wall Street Journal, the Newsday, the Universal, The New York Times and the LA Times.
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