It means "desert" in Arabic (6)
I believe the answer is:
sahara
'it means desert in arabic' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sahara that I've seen before include "World's largest sandy area" , "North African desert" , "Hottest desert" , "About 3,500,000 square miles of Africa" , "World's largest desert" .)