Award-winner's sponge cake not needing case of mine (5)

I believe the answer is:

adele

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'mine' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for adele that I've seen before include "Female singer from London" , "Performer" , "Woman" , "Singer with albums titled 19, 21 and 25" , "Popular female singer" .)

I've seen this clue in The Independent.

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