Dish busy playing with ball (8)
I believe the answer is:
syllabub
'dish' is the definition.
(syllabub is a type of dessert)
'busy playing with ball' is the wordplay.
'playing with' is an anagram indicator.
'busy' with its letters anagrammed with 'ball' can make 'SYLLABUB'.
(Other definitions for syllabub that I've seen before include "last part of meal?" , "Alcohol-laced dessert" , "Sweet creamy dessert" , "Traditional English dessert" , "Buy balls (anag) - sweet" .)