Car-free city (6)
I believe the answer is:
venice
'car-free city' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for venice that I've seen before include "Italian city once known as Queen of the Adriatic" , "City of gondolas on Adriatic" , "La Serenissima" , "Archdeacon subject to delay, it's implied, in" , "Wonderful Italian water-city" .)