Practicable (6)
I believe the answer is:
viable
'practicable' is the definition.
(I know that practicable can be written as viable)
This is the entire clue.
(Other definitions for viable that I've seen before include "Workable" , "Possible and practical" , "Having a prospect of success" , "(Of plan) capable of working" , "Able to function, grow normally" .)