Prohibit section of cartoon film about a European city (9)
I believe the answer is:
barcelona
'european city' is the definition.
(city in Spain)
'prohibit section of cartoon film about a' is the wordplay.
'prohibit' becomes 'bar' (to bar is to ban or prohibit).
'section of cartoon film' becomes 'cel' (sheet of film used in traditional animation).
'about' becomes 'on' (as in a book 'on' a certain topic).
'bar'+'cel'+'on'+'a'='BARCELONA'
(Other definitions for barcelona that I've seen before include "coastal city" , "City and province of Catalonia in NE Spain" , "Span. City" , "Spain's second largest city" , "Catalonian city" .)