Strategist (9)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
tactician
'strategist' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for tactician that I've seen before include "Military planner" , "Smart mover" , "Skilled planner" , "General" , "Strategist" .)