Arabian republic (5)
I believe the answer is:
yemen
'arabian republic' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for yemen that I've seen before include "Enemy (anag) - country of Arabia" , "Middle Eastern country" , "Arabian republic, capital Sanaa" , "Country to W. of Oman" , "Republic by the Red Sea" .)