Strategist (9)
I believe the answer is:
tactician
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">strategist</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 tactician that I've seen before include "Military planner" , "Smart mover" , "Skilled planner" , "General" , "Strategist" .)