Single item, that object behind Parisian article (4)
I believe the answer is:
unit
This clue could be a double definition.
'single item' is the first definition.
(I've seen this in another clue)
'object behind parisian article' is the second definition.
'unit' can be an answer for 'object' (thesaurus). I'm not sure about the 'behind parisian article' bit.
'that' is the link.
Can you help me to learn more?
(Other definitions for unit that I've seen before include "Quantity chosen as standard, or individual thing" , "Building block - small military force" , "Kitchen element?" , "Some fighting men" , "Item combining separate parts" .)