Herb troubled a nice gal (8)
I believe the answer is:
angelica
'herb' is the definition.
(I know that angelica is a type of herb)
'troubled a nice gal' is the wordplay.
'troubled' indicates an anagram.
'a'+'nice'+'gal'='anicegal'
'anicegal' with letters rearranged gives 'ANGELICA'.
(Other definitions for angelica that I've seen before include "sweetly-decorative thing" , "Candied stalks used for cake decoration" , "Candied stalks used to decorate cakes etc" , "Candied stalk used in cake decoration" , "Its candied leaves are used in cake decoration" .)