Jump on stage in a tutu then react ad-lib (9)

I believe the answer is:

entrechat

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

'stage in a tutu then react ad-lib' is the wordplay.
'then react' can be anagrammed to 'ENTRECHAT'.
Though, I am not clear how the anagram is indicated.

'on' is the link.

Can you help me to learn more?

(Other definitions for entrechat that I've seen before include "Ballet movement" , "Leap in the air" , "Ballet move" , "Vertical jump in ballet" , "Form of ballet jump" .)

I've seen this clue in The Independent.

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