Most Saudis (5)
I believe the answer is:
arabs
'most saudis' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for arabs that I've seen before include "eg Saudis" , "Graceful horses" , "Semitic people in the Middle East and northern Africa" , "Semitic people of the Middle East and North Africa" , "Semites" .)