As dessert, sounds very good (3)
I believe the answer is:
pie
'as dessert' is the definition.
I can't tell whether this definition defines the answer.
'sounds very good' is the wordplay.
'sounds' indicates a 'sounds like' (homophone) clue.
'very good' becomes 'pi' (old-fashioned term meaning pious).
'pi' is a homophone of 'PIE'.
Can you help me to learn more?
(Other definitions for pie that I've seen before include "Irrational things to do with circles and logs" , "what to cook for dinner?" , "In the sky, it's an empty promise" , "Covered flan" , "See 6" .)