Carried on to make flavouring (9)
I believe the answer is:
Here is my best explanation:
'flavouring' is the definition.
(coriander is a kind of flavouring)
'carried on to make' is the subsidiary indication.
'to make' indicates anagramming the letters.
'carriedon' with letters rearranged gives 'coriander'.
(Other definitions for coriander that I've seen before include "Parsley-like herb used in cooking", "spice", "Spice", "Aromatic herb", "An aromatic seed; carried on (anag.)", "Plant with spicy fruit", "plant", "Culinary herb", "Herb used with carrot for soup" and "leaves for cooking".)