How to generate no reason to get excited (4-2)

I believe the answer is:

turn-on

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'get excited' is the definition.

'how to generate no reason' is the wordplay.
I cannot quite understand how this works, but
'no' could be 'non' (I've seen this in other clues) and 'non' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

'to' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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