Tactics (10)
(Another definition for strategies that I've seen is " What planners need".)
(Other definitions for stratagems that I've seen before include "Manoeuvres" , "Plans" .)
'tactics' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for strategy that I've seen before include "Scheme" , "Get satyr to formulate tactics" , "Grand design" , "Plan or policy as for conducting campaign" , "Systematic plan of action" .)