Bit of strategy (6)
I believe the answer is:
tactic
'bit of strategy' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tactic that I've seen before include "An action planned to achieve a specific end" , "Ploy, strategem" , "Planned action/strategy" , "element of strategy" , "A skilful manoeuvre or procedure" .)