Capital of Vaucluse, France; seat of the papacy from 1309-77 (7)

I believe the answer is:

avignon

(Other definitions for avignon that I've seen before include "French city, once seat of Popes" , "French papal city" , "Les Demoiselles d'here, Picasso" , "French town with a 17 dn mentioned in song" , "French city, famous for its 12th century bridge" .)

I've seen this clue in The Mirror.

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