Italian dish that's the finished article (5)
I believe the answer is:
pasta
'italian dish' is the definition.
(type of Italian food)
'the finished article' is the wordplay.
'the finished' becomes 'past' (I've seen this in another clue).
'article' becomes 'a' (English indefinite article).
'past'+'a'='PASTA'
'that's' acts as a link.
(Other definitions for pasta that I've seen before include "dish that's Italian" , "Spaghetti, orzo etc" , "Basis for serving" , "Tapas (anag)" , "Linguine, e.g." .)