Tactic (4)

'tactic' is the definition.
(a ploy is a tactic or scheme)
This is all the clue.
(Other definitions for ploy that I've seen before include "Ruse or gimmick" , "Tactical scheme" , "Cunning tactic" , "Cunning manoeuvre to gain advantage" , "Ruse, stratagem" .)
(Other definitions for way that I've seen before include "Route; direction" , "'Manner, mode (3)'" , "Path" , "Manner; road" , "Method; route" .)