8a (6 letters). Iraqi city, the historic location of Sumer; the home of Sinbad the Sailor and a proposed location of the Garden of Eden (alternative spelling).
?S?A?
If B-A-G-D-A-D is the correct answer I have clue 10a wrong (4 and 5 letters)
Branches of computer network in which participants can engage in real-time discussions with one another.
I have CHAT ROOMS?? - giving me that S i clue above