Nightclub 50% discounted (5)

I believe the answer is:

disco

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'nightclub' is the definition.
(a disco is a club for dancing)

I don't understand the rest of the clue.

(Other definitions for disco that I've seen before include "Public dance hall with recorded music" , "equipment for playing recordings" , "Dancing to records" , "Dance club with recorded music" , "Style of music/dancing" .)

I've seen this clue in The Guardian.

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