French opera with finale from Messiaen (6)
I believe the answer is:
norman
'french' is the definition.
(Normandy is a part of France)
'opera with finale from messiaen' is the wordplay.
'opera' becomes 'norma' (I've seen this in another clue).
'with' says to put letters next to each other.
'finale from' says to take the final letters.
The last letter of 'messiaen' is 'n'.
'norma'+'n'='NORMAN'
(Other definitions for norman that I've seen before include "-- Wisdom, comedian" , "Style of architecture" , "Black Wednesday's Chancellor of the Exchequer" , "Someone who's not British" , "- Mailer, US author" .)