Old girl editor approved (6)
I believe the answer is:
okayed
'approved' is the definition.
('okay' can be a synonym of 'approve')
'old girl editor' is the wordplay.
'old' becomes 'o' (abbreviation).
'girl' becomes 'kay' ().
'editor' becomes 'ed' (abbreviation).
'o'+'kay'+'ed'='OKAYED'
(Other definitions for okayed that I've seen before include "Given the go-ahead" , "Sanctioned" , "given thumbs up" , "Allowed" , "Gave informal approval" .)