Pudding that’s prepared faster (6)
I believe the answer is:
afters
'pudding' is the definition.
(I've seen this before)
'prepared faster' is the wordplay.
'prepared' indicates an anagram.
'faster' is an anagram of 'AFTERS'.
'that's' acts as a link.
(Other definitions for afters that I've seen before include "Dessert, sweet" , "Sweet course" , "Strafe with desserts" , "Possibly fools" , "Informal desserts may be faster" .)