Forming part of a long-term plan (9)
I believe the answer is:
strategic
'forming part of a long-term plan' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for strategic that I've seen before include "Tactical" , "Forming part of a long-term plan" , "To do with a carefully workedout plan of action" , "Of long-term planning" , "Relating to long-term plans" .)