South Yemen port (4)
I believe the answer is:
aden
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">south yemen port</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 aden that I've seen before include "Dane in seaport of Yemen" , "Dean is in the Yemen, strangely" , "Yemeni port" , "Yemen's chief port" , "Strange Dane to be in the Yemen" .)