Yemeni port (4)
I believe the answer is:
aden
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">yemeni port</span>' is the definition.<br/ ><span class="explanation-format__explanation">(port in Yemen)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for aden that I've seen before include "Former Br. Gulf colony" , "Yemeni gulf" , "Yemen's chief port" , "Strange Dane to be in the Yemen" , "Port city of Yemen" .)