Development of chemical process involving carbon migration (8)
I believe the answer is:
creation
'development of chemical process' is the definition.
'creation' can be an answer for 'process' (I have seen 'Process of generation ' mean 'creation' so perhaps 'process' could also mean 'creation'). I am not certain of the 'development of chemical' bit.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for creation that I've seen before include "New product" , "Act of God" , "Something that has been made" , "concept" , "Process of generation" .)