Help papers in getting behind article (3)
I believe the answer is:
aid
'help' is the definition.
(synonyms)
'papers in getting behind article' is the wordplay.
'papers in' becomes 'id' (identifying documents are one's 'papers'. I am not sure about the 'in' bit.).
'getting behind' means one lot of letters go next to another (some letters go behind others).
'article' becomes 'a' (English indefinite article).
'id' put after 'a' is 'AID'.
Can you help me to learn more?
(Other definitions for aid that I've seen before include "charity" , "welfare" , "Good point" , "grant" , "Care, assistance" .)