Crossword Genius

With deception? (3)

Ross

I believe the answer is:

con

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'with' is the first definition.
Both the definition and answer are adverbs. Perhaps they are linked in a way I don't understand?

'deception?' is the second definition.
(a con is a trick or deception)

Can you help me to learn more?

(Other definitions for con that I've seen before include "Diddle" , "Dupe" , "Prisoner (sl.)" , "Trick, deceive" , "Swindle; steer" .)

I've seen this clue in the Evening Standard.
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