Chinese metropolis (8)
I believe the answer is:
shanghai
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">chinese metropolis</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 "Might the Shah gain in China?" , "Once impressive" , "Force to join ship's crew, Chinese port" , "in a combination of single, double and treble" , "Kidnap - Chinese port" .)