Government by the wealthy (10)
I believe the answer is:
plutocracy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">government by the wealthy</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 plutocracy that I've seen before include "wealthy elite" , "Government by the wealthy" , "rich people in government" .)