Order change — change initially involved (5)
I believe the answer is:
edict
'order' is the definition.
(I know that order can be written as edict)
'change change initially involved' is the wordplay.
'change' becomes 'edit' (editing is a kind of changing).
'initially' suggests taking the first letters.
'involved' is an insertion indicator.
The initial letter of 'change' is 'c'.
'edit' going around 'c' is 'EDICT'.
(Other definitions for edict that I've seen before include "Order issued by an authority" , "Injunction" , "Declaration" , "Authoritative decree" , "Official order" .)