Crossword Genius

Was up on (4)

Ross

I believe the answer is:

knew

'was up on' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for knew that I've seen before include "Was cognizant of" , "Was cognisant or aware of" , "Had learnt; sounds like modern" , "Understood" , "Was conscious of" .)

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