The most common and most likely answer to this crossword clue is the 7 letter word CAN-CAN
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More clues leading to the result CAN-CAN
Buddy explains!

The straight part
We know that "dance" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dance = can-can.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CAN-CAN mean?
CAN-CAN noun- A high-kicking chorus line dance originating in France.
- (motocross) A trick where one leg is brought over the seat, so that both legs are on one side.