Yemeni's neighbor (5)
I believe the answer is:
omani
'yemeni's neighbor' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for omani that I've seen before include "Middle Easterner" , "Gulf Arab" , "Gulf native" , "Speaker of Arabic" , "Naomi (anag) -- from Muscat?" .)