Article on French department reveals everything (3,3)
I believe the answer is:
the lot
'everything' is the definition.
(thesaurus)
'article on french department' is the wordplay.
'article' becomes 'the' (the 'definite article' part of speech).
'on' is a charade indicator (letters next to each other).
'french department' becomes 'lot' (department in southern France**).
'the'+'lot'='THE LOT'
'reveals' is the link.
(Other definitions for the lot that I've seen before include "Everything" , "goes under the hammer" .)