Main port of Yemen (4)
I believe the answer is:
aden
'main port of yemen' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for aden that I've seen before include "Former Br. Gulf colony" , "Yemen's chief port" , "Port city of Yemen" , "Dean is in the Yemen, strangely" , "foreign climes" .)