Some alternative backing for musical (5)

I believe the answer is:

evita

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

'musical' is the definition.
(Andrew Lloyd Webber musical)

'some alternative backing' is the wordplay.
'EVITA' is hidden back-to-front in amongst the letters.
But, I'm unsure how the hidden word is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for evita that I've seen before include "Eva Peron" , "1996 musical film, starring Madonna" , "Well-known musical" , "1978 Lloyd Webber musical" , "Peron musical" .)

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