Japanese military governor (6)
I believe the answer is:
shogun
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">japanese military governor</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for shogun that I've seen before include "Japanese head" , "Foreign C-in-C" , "Japanese military dictator" , "Hereditary commander-in-chief in feudal Japan" , "Hereditary military dictator of Japan until 1868" .)