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Theorem, if true, rejigged signature aspect of a waltz (5-4,4)

Ross

I believe the answer is:

three-four time

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

'a waltz' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

'theorem if true rejigged signature aspect' is the wordplay.
'theorem if true' can be anagrammed to 'THREE-FOUR TIME'.
However, I'm not sure how the anagram is indicated.

'of' is the link.

Can you help me to learn more?

(Another definition for three-four time that I've seen is " Waltz tempo".)

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