Crossword Genius

Suspicious of (4)

Ross

I believe the answer is:

onto

'suspicious of' is the definition.
(as in 'the police are onto us')

This is the entire clue.

(Other definitions for onto that I've seen before include "To a place on" , "Rumbling" , "To a position on (something)" , "Small Scottish farm" , "To the whole of (maths.)" .)

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