New York City borough (9)
I believe the answer is:
manhattan
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">new york city borough</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 manhattan that I've seen before include "intoxicating drink" , "New York City borough" , "NY borough" , "Cocktail of whiskey and sweet vermouth" , "Island of New York - cocktail" .)