South Korean capital (5)
I believe the answer is:
seoul
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">south korean capital</span>' is the definition.<br/ ><span class="explanation-format__explanation">(capital of South Korea)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for seoul that I've seen before include "Capital city" , "Olympic venue" , "Asian capital" , "19 [EASTERN] capital" , "South Korea capital" .)