Capital of Canada (6)
I believe the answer is:
ottawa
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">capital of canada</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ottawa that I've seen before include "The capital of Canada (6)" , "capital city" , "somewhere in Canada" , "Canadian capital" , "N. American city" .)