Food that's topping served on the base (5)

I believe the answer is:

pizza

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'food' is the definition.
(pizza is a kind of food)

I can't explain the remainder of the clue.

(Other definitions for pizza that I've seen before include "round dish" , "Italian dough based dish" , "Four seasons, perhaps" , "Italian open pie made with thin dough" , "Dough-based dish" .)

I've seen this clue in The Guardian.

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