Crossword Genius

Wicked indulgence stuffing up legality? Absolutely (6,8)

Ross

I believe the answer is:

guilty pleasure

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

'wicked indulgence stuffing up legality?' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'absolutely' is the wordplay.
I cannot really understand how this works, but
'absolutely' could be 'sure' and 'sure' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

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