Delicious starter with frosting chopped up (5)
I believe the answer is:
diced
'chopped up' is the definition.
(I've seen this in another clue)
'delicious starter with frosting' is the wordplay.
'starter' indicates taking the first letters.
'with frosting' becomes 'iced' (I've seen this in another clue).
The first letter of 'delicious' is 'd'.
'd'+'iced'='DICED'
(Other definitions for diced that I've seen before include "Chopped; gambled" , "Chopped into cubes" , "Cut into small cubes" , "getting the chop!" , "Played with small cubes" .)