Crossword Genius

Produce dark impossible dance? (4,3,5,9)

Ross

I believe the answer is:

trip the light fantastic

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

'dance?' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for trip the light fantastic that I've seen is " [DANCE] - with 8d".)

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