Article with myself as subject (5)
I believe the answer is:
theme
'subject' is the definition.
('theme' can be a synonym of 'subject')
'article with myself' is the wordplay.
'article' becomes 'the' (the 'definite article' part of speech).
'with' is a charade indicator (letters next to each other).
'myself' becomes 'me'.
'the'+'me'='THEME'
'as' acts as a link.
(Other definitions for theme that I've seen before include "tune used in Enigma Variations?" , "A subject or repeated melody" , "idea of the work" , "Motif that's repeated" , "Topic; melody" .)