Crossword Genius

Not fooled by (4)

Ross

I think it could be either:

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4

6

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

I've seen this clue in the Newsday, the USA Today, the LA Times, The New York Times, The Wall Street Journal and the Universal.
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