The most common and most likely answer to this crossword clue is the 10 letter word LOCOMOTION
I've seen this crossword clue in The Times
L
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M
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More clues leading to the result LOCOMOTION
- Old dance is crazy subject for discussion
- Ridiculous proposal going forward, perhaps?
- The power to shift daft proposal in parliament?
- See company proposal for moving capacity
- There’s something soothing about crooner for a dance
- Moving crazy subject for debate
- Little excitement when discussing progress
- ‘Mad Proposal’ that might have been Spinning Around by Kylie
- Crazy man’s concept — destroying nature primarily for progress
- Movement offering stupid proposal at meeting?
Buddy explains!

The straight part
We know that "Old dance" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case old dance = locomotion.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 LOCOMOTION mean?
LOCOMOTION noun- The ability to move from place to place, or the act of doing so.
- Self-powered motion by which a whole organism changes its location through walking, running, jumping, crawling, swimming or flying.
- (often preceded by definite article) A dance, originally popular in the 1960s, in which the arms are used to mimic the motion of the connecting rods of a steam locomotive.