Aden citizen (6)
I believe the answer is:
yemeni
'aden citizen' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for yemeni that I've seen before include "Someone from Aden?" , "ME citizen" , "Person from Sana'a, say" , "from the Middle East" , "Relating to a republic on the Arabian Peninsula" .)