The French entrance Papal ambassador (6)
I believe the answer is:
legate
'papal ambassador' is the definition.
(I've seen this before)
'the french entrance' is the wordplay.
'the french' becomes 'le' ('the' in French).
'entrance' becomes 'gate' (type of entrance).
'le'+'gate'='LEGATE'
(Other definitions for legate that I've seen before include "Late, eg. for the papal representative" , "Official emissary" , "Papal ambassador" , "papal emissary" , "Envoy representing the Pope" .)