Car-free city (6)
I believe the answer is:
venice
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">car-free city</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)