Crossword Genius

With 45-Across, informed on the latest (4)

Ross

I believe the answer is:

upto

(Other definitions for upto that I've seen before include "As many as, though no more" , "Pout being occupied with" , "Capable of or engaged in" , "To the time that" , "Capable of; dependent on" .)

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