Subject of article – me! (5)
I believe the answer is:
theme
'subject' is the definition.
('theme' can be a synonym of 'subject')
'article me' is the wordplay.
'article' becomes 'the' (the 'definite article' part of speech).
'the'+'me'='THEME'
'of' acts as a link.
(Other definitions for theme that I've seen before include "idea of the work" , "Topic, leitmotif" , "Melody on which variations are constructed" , "notedly subject to variation" , "Subject (on which person writes, speaks)" .)