A very good-sounding dessert (3)
I believe the answer is:
pie
'dessert' is the definition.
(pie is an example of a dessert)
'a very good-sounding' is the wordplay.
'a very good' becomes 'pi' (I've seen this in other clues).
'sounding' shows a homophone (sound like).
'pi' sounds like 'PIE'.
(Other definitions for pie that I've seen before include "Cooked food" , "Dish baked in pastry-lined pan" , "Anna's constituent" , "In the sky, it's a hopeless idea" , "Filled pastry" .)