Crossword Genius

The easy answer to what to have for dessert (3)

Ross

I believe the answer is:

pie

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'dessert' is the definition.
(pie is an example of a dessert)

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

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(Other definitions for pie that I've seen before include "welcome luxury" , "Pastry product" , "Cooked food" , "Crusty dish" , "Slapstick missile" .)

I've seen this clue in the Evening Standard.
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