City of canals (6)
I believe the answer is:
venice
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">city of canals</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 "North Italian port" , "major tourist attraction" , "City and former republic in NE Italy" , "Northeast Italian port and tourist attraction" , "City of gondoliers" .)