Deceive, causing some confusion (3)

I believe the answer is:

con

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'deceive' is the definition.
(I've seen this before)

'causing some confusion' is the wordplay.
'some' suggests taking the first letters.
'confusion' becomes 'on' (I can't explain this - if you can you should believe this answer much more).
The first letter of 'causing' is 'c'.
'c'+'on'='CON'

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(Other definitions for con that I've seen before include "Learn; swindle" , "Tory" , "Deceive (someone)" , "Deceive; convict (colloq.)" , "Swindle; steer" .)

I've seen this clue in the Evening Standard.

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