Article discovered in French region is proof of origin (10)
I believe the answer is:
provenance
'proof of origin' is the definition.
'provenance' can be an answer for 'origin' (provenance is a kind of origin). I am unsure of the 'proof of' bit.
'article discovered in french region' is the wordplay.
'article' becomes 'an' (English indefinite article).
'discovered in' means one lot of letters goes inside another.
'french region' becomes 'provence' (I've seen this before).
'an' put into 'provence' is 'PROVENANCE'.
'is' is the link.
Can you help me to learn more?
(Other definitions for provenance that I've seen before include "Documented history" , "Source of painting" , "Origin of" .)