Paul's online flimflam (3,4)

I believe the answer is:

con game

'flimflam' is the definition.
(synonyms)

'paul's online' is the wordplay.
I cannot really see how this works, but
'online' could be 'on' (similar in meaning) and 'on' is found within the answer.
This may be the basis of clue (or it may be nonsense).

(Another definition for con game that I've seen is " Sting".)

I've seen this clue in The Guardian.

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