A show worth listening to? (7)

I believe the answer is:

musical

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'a show' is the definition.
(I know that show can be written as musical)

I don't understand the remainder of the clue.

(Other definitions for musical that I've seen before include "Pleasant-sounding" , "Eg, Cats or Evita" , "Tommy, for one" , "Oliver perhaps" , "Tuneful; stage work" .)

I've seen this clue in the Evening Standard.

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