Dunce’s dessert (4)

I believe the answer is:

fool

I believe this clue is a double definition.

'dunce's' is the first definition.
(both can mean a stupid person)

'dessert' is the second definition.
(type of dessert)

(Other definitions for fool that I've seen before include "` `More people know Tom .... that Tom .... knows' '" , "Trifle" , "Dupe - dessert" , "Charlie" , "Empty-headed person" .)

I've seen this clue in The Mirror.

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