Subject of article not quite perused (6)
I believe the answer is:
thread
'subject' is the definition.
(thesaurus)
'article not quite perused' is the wordplay.
'article' becomes 'the' (the 'definite article' part of speech).
'not quite' means to remove the last letter.
'perused' becomes 'read' (I've seen this before).
'the' with its final letter removed is 'th'.
'th'+'read'='THREAD'
'of' acts as a link.
(Other definitions for thread that I've seen before include "Cord - Internet chat room discussion" , "Essential element" , "Fine cord of twisted fibres" , "The spiral ridge of a screw" , "'Strand of cotton, silk etc (6)'" .)