Czar's parliament (4)
I believe the answer is:
duma
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">czar's parliament</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 duma that I've seen before include "Russian state assembly" , "council" , "Russian elected parliament" , "Russian legislative assembly" .)