Capital of Croatia (6)
I believe the answer is:
zagreb
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">capital of croatia</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for zagreb that I've seen before include "European capital" , "European city" , "on River Sava" , "Croatia's capital city" , "Croatian city" .)