I published one article for national (7)
I believe the answer is:
iranian
'national' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'i published one article' is the wordplay.
'published' becomes 'ran' (running is a kind of publishing).
'one' becomes 'i' (Roman numeral).
'article' becomes 'an' (English indefinite article).
'i'+'ran'+'i'+'an'='IRANIAN'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for iranian that I've seen before include "Khamenei or Rouhani, say" , "From Tehran, perhaps?" , "from the Middle East" , "Native of modern Persia" , "Foreign national" .)