Carried on cooking herb (9)
I believe the answer is:
coriander
'herb' is the definition.
(I know that coriander is a type of herb)
'carried on cooking' is the wordplay.
'cooking' is an anagram indicator (letters cooked up into a new form).
'carried'+'on'='carriedon'
'carriedon' is an anagram of 'CORIANDER'.
(Other definitions for coriander that I've seen before include "leaves for cooking" , "Aromatic herb" , "Culinary herb" , "Parsley-like herb used in cooking" , "ingredient of coronation chicken?" .)