Article I had submitted to editor helped (5)
I believe the answer is:
aided
'helped' is the definition.
('aid' can be a synonym of 'help')
'article i had submitted to editor' is the wordplay.
'article' becomes 'a' (English indefinite article).
'had' means one lot of letters go next to another.
'submitted to' becomes 'd' (I can't justify this - if you can you should believe this answer much more).
'editor' becomes 'ed' (abbreviation).
'a'+'i'+'d'+'ed'='AIDED'
Can you help me to learn more?
(Other definitions for aided that I've seen before include "given assistance" , "'Assisted, helped (5)'" , "not under their own steam?" .)