Crossword Genius

Had no doubt about (4)

Ross

I believe the answer is:

knew

'had no doubt about' 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 "Distinguished" , "Was aware of the fact" , "Was cognizant of" , "Was cognisant or aware of" , "Had learnt; sounds like modern" .)

I've seen this clue in the Newsday, the Newsday.com and The Washington Post Sunday.
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