Crossword Genius

Is sure of (5)

Ross

I believe the answer is:

knows

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

This is all the clue.

(Other definitions for knows that I've seen before include "Recognises" , "Understands" , "Is aware of" .)

I've seen this clue in the Newsday and The Wall Street Journal.
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