Canada's largest city (7)
I believe the answer is:
toronto
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">canada's largest city</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for toronto that I've seen before include "Second city of Canada" , "Capital city of Ontario" , "Ontario's capital" , "Transatlantic city" , "Ontarian capital" .)