Fruit and nut, alas, all mixed up together (7)

I believe the answer is:

sultana

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'fruit' is the definition.
(sultana is a kind of fruit)

'nut alas all mixed up together' is the wordplay.
'nut alas' anagrams to 'SULTANA'.
Though, I'm not clear how this is indicated.

'and' acts as a link.

Can you help me to learn more?

(Other definitions for sultana that I've seen before include "fruity little thing" , "Shrivelled up" , "Dried fruit - Muslim ruler's consort" , "Royal lady" , "Dry seedless grape" .)

I've seen this clue in The Guardian and The Globe and Mail.

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