A trick or deception — or utter nonsense (4,4)

I believe the answer is:

flim flam

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

'a trick' is the definition.
(I know that trick can be written as flim-flam)

'deception or utter nonsense' is the wordplay.
I cannot quite understand how this works, but
'deception' could be 'flam' (I've seen this in another clue) and 'flam' is present in the answer.
This explanation may well be incorrect...

'or' is the link.

Can you help me to learn more?

(Another definition for flim flam that I've seen is " Nonsense".)

I've seen this clue in The Times.

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