Understanding French in wine catalogue finally (7)
I believe the answer is:
entente
'understanding' is the definition.
(an entente is an alliance or understanding)
'french in wine catalogue finally' is the wordplay.
'french in' becomes 'en' (French for 'in').
'wine' becomes 'tent' (type of Spanish wine).
'finally' says to take the final letters.
The final letter of 'catalogue' is 'e'.
'en'+'tent'+'e'='ENTENTE'
(Other definitions for entente that I've seen before include "International agreement" , "A friendly underatanding between countries, may be cordiale" , "Diplomatic agreement" , "Friendly agreement between states" , "Interstate understanding" .)