It’s not important, ballroom dance’s repeats both being foxtrot (5)

I believe the answer is:

chaff

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'it's not important' is the definition.
(as in 'separating the wheat from the chaff')

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for chaff that I've seen before include "Winnowed husks of grain" , "twit" , "Light banter - husks from corn" , "Laugh at" , "shells" .)

I've seen this clue in The Times.

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