Music having dotted feel? (5)

I believe the answer is:

polka

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'music' is the definition.
(polka is a kind of music)

I can't explain the remainder of the clue.

(Other definitions for polka that I've seen before include "Lively dance (but dotty?)" , "Take rapid steps" , "Dance originally from part of 1 across" , "Czech dance" , "Lively dance, originally from Bohemia" .)

I've seen this clue in The Sun.

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