Note following article's subject (5)
I believe the answer is:
theme
'subject' is the definition.
('theme' can be a synonym of 'subject')
'note following article's' is the wordplay.
'note' becomes 'me' (**).
'following' is a charade indicator (letters next to each other).
'article' becomes 'the' (the 'definite article' part of speech).
'me' put after 'the' is 'THEME'.
(Other definitions for theme that I've seen before include "Pervading idea in art" , "thing under discussion" , "argument" , "idea of the work" , "Subject matter, motif" .)