Crossword Genius

Was sure of (4)

Ross

I believe the answer is:

knew

'was sure of' 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 cognizant of" , "Had learnt; sounds like modern" , "Recognised" , "Acknowledged" , "Was cognisant or aware of" .)

I've seen this clue in the Universal and the Newsday.
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