In favour of first of changes editor made (6)
I believe the answer is:
forced
'made' is the definition.
(as in making someone do something)
'in favour of first of changes editor' is the wordplay.
'in favour of' becomes 'for' (being for a particular cause).
'first of changes' becomes 'c' (1st letter of 'changes').
'editor' becomes 'ed' (abbreviation).
'for'+'c'+'ed'='FORCED'
(Other definitions for forced that I've seen before include "Not natural" , "Strained, unnatural" , "Compelled or obliged" , "Compelled, made to obey" , "Not spontaneous" .)