Most Tunisians (5)
I believe the answer is:
arabs
'most tunisians' 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 "Semitic people of the Middle East and North Africa" , "eg Saudis" , "Semites" , "Semitic people in the Middle East and northern Africa" , "Fine horses" .)