Crossword Genius

Completion document: Abbr. (4)

Ross

I believe the answer is:

cert

(Other definitions for cert that I've seen before include "Sure thing (colloq.)" , "Sure thing (that could be dead!)" , "Infallible bet (slang)" , "Sure thing (sl.)" , "Safe bet" .)

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