Crossword Genius

Had no doubt (4)

Ross

I believe the answer is:

knew

'had no doubt' is the definition.
(I've seen this in another clue)

This is all the clue.

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

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