China's most populous city (8)
I believe the answer is:
shanghai
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">china's most populous city</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for shanghai that I've seen before include "once used to drug sailors, possibly" , "Trick someone into joining a ship's crew unwillingly (in China?)" , "Largest city in China" , "How to impress a sailor" , "[YANGTZE] 's mouth here?" .)