A fool, perhaps, to leave, you say (7)

I believe the answer is:

dessert

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'a fool perhaps' is the definition.
(fool is a type of dessert)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for dessert that I've seen before include "Charlotte maybe" , "tart?" , "Sweet, last course of a meal" , "Pudding, sweet" , "Fool possibly" .)

I've seen this clue in the Evening Standard.

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