Dancer who's not on the level (7)

I believe the answer is:

twister

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'level' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for twister that I've seen before include "Cheat - tornado" , "See 12" , "Tornado (American)" , "Colloquial name for a tornado" , "Dishonest person" .)

I've seen this clue in The Irish Independent.

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