The Pope’s ambassador at the French entrance (6)
I believe the answer is:
legate
'the pope's ambassador' is the definition.
'legate' can be an answer for 'ambassador' (I've seen this in another clue). I'm not certain of the 'the pope's' bit.
'at the french entrance' is the wordplay.
'at' is a charade indicator (letters next to each other).
'the french' becomes 'le' ('the' in French).
'entrance' becomes 'gate' (type of entrance).
'le'+'gate' is 'LEGATE'.
Can you help me to learn more?
(Other definitions for legate that I've seen before include "Papal envoy from Galtee" , "Vatican emissary" , "Envoy, maybe papal" , "One being tested" , "Late, eg. for the papal representative" .)