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' (the indefinite article in English).
'had' says to put letters next to each other.
'submitted to' becomes 'd' (I can't explain this - if you can you should give a lot more credence to this answer).
'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?" .)