Russian royalist (7)
I believe the answer is:
tsarist
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">russian royalist</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tsarist that I've seen before include "Artists (anag.); supporter of Russian emperor" , "Russian monarchist" , "Supporter of the Russian Empire" , "Russian emperor's supporter" , "Russian royalist" .)