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 wordplay.
'to make' indicates an anagram.
'carriedon' with letters rearranged gives 'CORIANDER'.
(Other definitions for coriander that I've seen before include "Parsley-like herb used in cooking", "Spice", "leaves for cooking", "Carried on with the strange herb", "An aromatic seed; carried on (anag.)", "Plant with spicy fruit", "spice", "Aromatic herb", "Herb used with carrot for soup" and "Culinary herb".)