Crossword Genius

Food's standard of niceness (3)

Ross

I believe the answer is:

pie

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'food's' is the definition.
(pie is a kind of food)

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

Can you help me to learn more?

(Other definitions for pie that I've seen before include "Dish baked in pastry-lined pan" , "Filled pastry" , "See 6" , "Very easy answer as" , "In the sky, it's an empty promise" .)

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