Verse is to go after advertisement, editor suggested (7)
I believe the answer is:
advised
'suggested' is the definition.
('advise' can be a synonym of 'suggest')
'verse is to go after advertisement editor' is the wordplay.
'verse' becomes 'v'.
'to go after' says to put letters next to each other.
'advertisement' becomes 'ad' (synonyms).
'editor' becomes 'ed'.
'v'+'is'='vis'
'vis' put after 'ad' is 'advis'.
'advis'+'ed'='ADVISED'
(Other definitions for advised that I've seen before include "Warned" , "Sensible; recommended (a course of action)" , "Notified" , "Given recommendation" , "Informed" .)