Dessert given to one quiet and silly (7)
I believe the answer is:
foolish
'silly' is the definition.
(similar in meaning)
'dessert given to one quiet' is the wordplay.
'dessert' becomes 'fool' (type of dessert).
'given to' is a charade indicator (letters next to each other).
'one' becomes 'I' (Roman numeral).
'quiet' becomes 'sh' (both can be said to tell someone to be quiet).
'fool'+'i'+'sh'='FOOLISH'
'and' is the link.
(Other definitions for foolish that I've seen before include "Unwise or ridiculous" , "Half-baked" , "Silly, lacking common sense" , "Absurd, not sensible" , "Imprudent" .)