Arabian gulf port
I believe the answer is:
aden
'arabian gulf port' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aden that I've seen before include "Dean out in the seaport city" , "Red Sea port" , "Dean is out in the Middle Eastern port" , "Port city of Yemen" , "Former Br. Gulf colony" .)