Show main tempo should be changed (9)

I believe the answer is:

pantomime

I'm a little stuck... Click here to teach me more about this clue!

'show' is the definition.
(I've seen this before)

'main tempo should be changed' is the wordplay.
'main tempo' anagrams to 'PANTOMIME'.
However, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for pantomime that I've seen before include "Play performed at Christmas" , "Mime on tap in children's show" , "'Cinderella', for example" , "Seasonal theatre show" , "eg 'Mother Goose'" .)

I've seen this clue in The Sun.

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