Orders changes to capture carbon (6)
I believe the answer is:
edicts
'orders' is the definition.
('edict' can be a synonym of 'order')
'changes to capture carbon' is the wordplay.
'changes' becomes 'edits' (editing is a kind of changing).
'to capture' is an insertion indicator.
'carbon' becomes 'C' (C is the chemical symbol for carbon).
'edits' enclosing 'c' is 'EDICTS'.
(Other definitions for edicts that I've seen before include "rulings" , "Proclamation" , "Commands" , "Official orders issued by authority" , "Orders proclaimed by an authority" .)