Article with yours truly as subject (5)
I believe the answer is:
theme
'subject' is the definition.
(theme can mean a topic or subject)
'article with yours truly' is the wordplay.
'article' becomes 'the' (the definite article in English).
'with' means one lot of letters go next to another.
'yours truly' becomes 'me' (the person who set this crossword).
'the'+'me'='THEME'
'as' is the link.
(Other definitions for theme that I've seen before include "Motif or melody" , "idea of the work" , "Leitmotiv" , "sort of tune" , "thing under discussion" .)