Novel or ancient instrument cases (7)

I believe the answer is:

rebecca

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'novel' is the definition.
(Daphne du Maurier novel)

'ancient instrument cases' is the wordplay.
'ancient instrument' becomes 'rebec' (I've seen this in another clue).
'cases' becomes 'ca' (I can't justify this - if you can you should give a lot more credence to this answer).
'rebec'+'ca'='REBECCA'

'or' acts as a link.

Can you help me to learn more?

(Other definitions for rebecca that I've seen before include "riotous girl" , "Maxim she betrayed" , "Literary heroine" , "Daphne du Maurier novel; girl's name" , "Girl's name - mother of Jacob and Esau" .)

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

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