Candied stalks used in cake decoration — nag Alice (anag) (8)
I believe the answer is:
angelica
(Other definitions for angelica that I've seen before include "Decorative candied stalk" , "Candied stalks used to decorate cakes etc" , "Candied stalks used for cake decoration" , "What's good for decorating cakes" , "Its candied leaves are used in cake decoration" .)