Careful and sensible (7)
I believe the answer is:
prudent
'careful and sensible' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for prudent that I've seen before include "With care/forethought" , "Careful, circumspect" , "Careful and sensible" , "Judicious" , "Cautious; discreet" .)