Chief city of Moravia (4)
I believe the answer is:
brno
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">chief city of moravia</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for brno that I've seen before include "Moravian city" , "European city" , "City of Czech Republic" , "Second city of Czech R." , "The place" .)