Lebanese capital (6)
I believe the answer is:
beirut
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lebanese capital</span>' is the definition.<br/ ><span class="explanation-format__explanation">(capital of Lebanon)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for beirut that I've seen before include "Capital city of Lebanon" , "Lebanese capital" , "Middle East capital" , "Lebanon's capital" , "Capital of 21 across" .)