Subject of article connected with Maine (5)
I believe the answer is:
theme
'subject' is the definition.
(theme can mean a topic or subject)
'article connected with maine' is the wordplay.
'article' becomes 'the' (the definite article).
'connected with' says to put letters next to each other.
'maine' becomes 'me' (abbreviation).
'the'+'me'='THEME'
'of' is the link.
(Other definitions for theme that I've seen before include "Subject (of talk, text, etc)" , "Short melody" , "Burden" , "[(type of) PARK]" , "Thread, melody" .)