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