Crossword Genius

Tintin's naughty knees-up? (6)

Ross

I believe the answer is:

cancan

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'naughty knees-up?' is the definition.
(suggestive dance)

I don't understand the remainder of the clue.

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(Other definitions for cancan that I've seen before include "Lively stage dance, doubly permissive" , "Daring French dance, doubly permissive" , "Parisian stage dance" , "High-kicking dance of a female chorus line" , "Lively French stage dance" .)

I've seen this clue in The Telegraph.
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