Crossword Genius

Cake ingredient for ruler’s wife (7)

Ross

I believe the answer is:

sultana

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

'cake ingredient' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

'ruler's wife' is the wordplay.
I cannot really understand how this works, but
'ruler' could be 'sultan' (sultan is a kind of ruler) and 'sultan' is located in the answer.
A single letter 'a' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

'for' is the link.

Can you help me to learn more?

(Other definitions for sultana that I've seen before include "Grape; ruler's wife" , "bit of a fruit cake" , "Shrivelled up" , "mistress abroad" , "sovereign's woman" .)

I've seen this clue in The Times.
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