Crossword Genius

Was certain of (4)

Ross

I believe the answer is:

knew

'was certain of' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for knew that I've seen before include "Understood" , "Was familiar with" , "Was cognisant or aware of" , "Was aware of the fact" , "Distinguished" .)

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