Crossword Genius

"I'm ___ you!" ("Can't fool me!") (4)

Ross

I believe the answer is:

onto

(Other definitions for onto that I've seen before include "Rumbling" , "To a position on (something)" , "forward, with a destination" , "In contact with - aware of" , "(Moving) aboard" .)

I've seen this clue in the USA Today.
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