Wise, prudent (4)
I believe the answer is:
sage
I believe this clue is a double definition.
'wise' is the first definition.
(similar in meaning)
'prudent' is the second definition.
(both can mean wise)
(Other definitions for sage that I've seen before include "Fragrant herb having wisdom" , "Learned" , "Aromatic herb" , "Wise green herb?" , "Herb; wise person" .)