Iran's capital (6)
I believe the answer is:
tehran
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">iran's capital</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tehran that I've seen before include "Capital city of Iran (6)" , "Iranian capital" , "Iran's capital" .)