Dries all around; unbelievably bad inside in acts of wicked mischief (9)

I believe the answer is:

devilries

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'in acts of wicked mischief' is the definition.
I can't judge whether this definition defines the answer.

'dries all around unbelievably bad' is the wordplay.
'all around' is an insertion indicator.
'unbelievably bad' becomes 'evil' (associated in meaning. I am not sure about the 'unbelievably' bit.).
'dries' placed around 'evil' is 'DEVILRIES'.

'inside' acts as a link.

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I've seen this clue in the Sydney Morning Herald.

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