Wonderful choice when ordering a pizza (7)

I believe the answer is:

topping

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'pizza' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for topping that I've seen before include "Sauce; excellent (dated)" , "custard?" , "A1" , "Garnish - jolly good!" , "garnish for food" .)

I've seen this clue in The Times.

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