A page with purpose? Editor agreed (9)
I believe the answer is:
appointed
'agreed' is the definition.
(both can mean decided or arranged)
'a page with purpose? editor' is the wordplay.
'page' becomes 'p'.
'with' says to put letters next to each other.
'purpose?' becomes 'point' (I've seen this before).
'editor' becomes 'ed'.
'a'+'p'+'point'+'ed'='APPOINTED'
(Other definitions for appointed that I've seen before include "Selected for a job" , "Furnished" , "Designated" , "Nominated to a position" , "Given a job" .)