Capital of Saudi Arabia (6)
I believe the answer is:
riyadh
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">capital of saudi arabia</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for riyadh that I've seen before include "Arab capital" , "Middle Eastern venue" , "Capital city of Saudi Arabia" , "Capital of Saud Arabia" , "Saudi Arabia's largest city" .)