Semitic language (6)
'semitic language' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for arabic that I've seen before include "Correspond; last word of Othello" , "Major language of Middle East" , "Semitic language" , "Language (by gum!)" , "Final" .)
(Other definitions for hebrew that I've seen before include "Member of people" , "National language of Israel" , "Tongue" , "Israel's official language" , "Ancient Semitic language, used in modern version in Israel" .)