Area west of the Gulf of Aqaba (5)
I believe the answer is:
sinai
'area west of the gulf of aqaba' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sinai that I've seen before include "11 Across peninsula" , "Ten Commandments mountain" , "Peninsula, mostly desert, at north end of Red Sea" , "Egyptian desert" , "Mount where Moses received God's law" .)