TV channel doesn't show very popular dance music (5)

I believe the answer is:

disco

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'popular dance music' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for disco that I've seen before include "Demonic spirit" , "Youngsters' dance venue" , "20 club" , "lively entertainment, for some?" , "party for dancers" .)

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