Crossword Genius

Was sure (4)

Ross

I believe the answer is:

knew

'was sure' 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" , "Distinguished" , "Was familiar with" , "Was aware of the fact" .)

I've seen this clue in the LA Times and the King Feature Syndicate.
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