Certain musical parts in ballet, oddly (10)

I believe the answer is:

inevitable

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'certain musical parts in ballet oddly' is the definition.
I can't tell whether this definition defines the answer.

'certain musical parts in ballet oddly' is the wordplay.
'certain musical' becomes 'evita' (Andrew Lloyd Webber musical. I am not sure about the 'certain' bit.).
'parts' indicates putting letters inside (in the sense of cuts or separates).
'oddly' indicates alternate letters (letters in the odd-numbered positions are used).
The alternating letters of 'ballet' are 'ble'.
'in'+'ble'='inble'
'evita' placed into 'inble' is 'INEVITABLE'.

Can you help me to learn more?

(Other definitions for inevitable that I've seen before include "Inescapable" , "Unavoidable, fated" , "Certain to happen" .)

I've seen this clue in The Sunday Times and The Times.

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