Delightful topping to be used later (4)
I believe the answer is:
nice
'delightful' is the definition.
(thesaurus)
'topping to be used later' is the wordplay.
'topping' means to remove the first letter (top can mean to remove the top from something).
'to be used later' becomes 'onice'.
'onice' with its initial letter removed is 'NICE'.
(Other definitions for nice that I've seen before include "Pleasant city in south of France" , "Attractive Mediterranean resort" , "Pleasant-sounding city in S France" , "good" , "Amiably pleasant" .)