Possible evidence of climate change hoax (4-2)

I believe the answer is:

wind-up

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

'possible evidence of climate' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'change hoax' is the wordplay.
I cannot quite understand how this works, but
'change' could be 'wind' (wind is a kind of change) and 'wind' is located in the answer.
The remaining letters 'up' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.

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