Plan, purpose (9)
I believe the answer is:
intention
This clue is a double definition.
'plan' is the first definition.
(I've seen this before)
'purpose' is the second definition.
(I know that purpose can be written as intention)
(Other definitions for intention that I've seen before include "Plan, purpose" , "Design" , "Aim, objective" , "Aim, purpose" , "Aim, plan" .)