Crossword Genius

Show in which Calvin takes an amusing part (7)

Ross

I believe the answer is:

musical

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for musical that I've seen before include "Cats maybe" , "eg Chicago" , "Show, with numbers" , "Eg, Cats or Evita" , "Rent for one" .)

I've seen this clue in the Evening Standard.
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