Ratified two companies welcoming new editor (9)
I believe the answer is:
confirmed
'ratified' is the definition.
(thesaurus)
'two companies welcoming new editor' is the wordplay.
'two companies' can mean two substitutions for 'company'.
'company' becomes 'co' (abbreviation).
'company' becomes 'firm' (firm can mean a company or business).
'welcoming' indicates putting letters inside (in sense of 'inviting in').
'new' becomes 'n' (abbreviation as in New Testament NT).
'editor' becomes 'ed' (abbreviation).
'co'+'firm'='cofirm'
'cofirm' going around 'n' is 'confirm'.
'confirm'+'ed'='CONFIRMED'
(Other definitions for confirmed that I've seen before include "Stated with assurance that something was true" , "Verified" .)