Sanaa is its capital (5)
I believe the answer is:
yemen
'sanaa is its capital' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for yemen that I've seen before include "Aden is found here" , "Saudi neighbour" , "nation" , "Enemy country in S Arabian peninsula" , "Republic sited on the SW corner of Arabia" .)