Lyrics discovered in jotter Bill returned (8)

Ross

I believe the answer is:

libretto

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'lyrics discovered' is the definition.
I can't tell whether this defines the answer.

'in jotter bill returned' is the wordplay.
'in' indicates the answer is hidden within the clue.
'returned' says the letters should be written backwards.
'otterbil' can be found hidden inside 'jotter bill'.
'otterbil' back-to-front is 'LIBRETTO'.

Can you help me to learn more?

(Other definitions for libretto that I've seen before include "Operatic book" , "The words of an opera or musical play" , "Text set to music in opera" , "Book of words of an opera" , "Words set to music, especially opera" .)

I've seen this clue in The Guardian.

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