EU supporting wealthy priest, a minister in Paris (9)
I believe the answer is:
richelieu
'a minister in paris' is the definition.
(Cardinal Richelieu, French clergyman)
'eu supporting wealthy priest' is the wordplay.
'supporting' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'wealthy' becomes 'rich' (similar in meaning).
'priest' becomes 'eli' (biblical figure).
'rich'+'eli'='richeli'
'eu' after 'richeli' is 'RICHELIEU'.
(Other definitions for richelieu that I've seen before include "French cardinal/politician" , "Seventeenth century French cardinal and statesman" , "French politician" , "Cardinal, minister to Louis XIII" , "Chief minister to Louis XIII" .)