Wisdom; sagacity (8)
I believe the answer is:
prudence
I believe this clue is a double definition.
'wisdom' is the first definition.
(I know that prudence is a type of discernment)
'sagacity' is the second definition.
(I know that prudence is a type of sagacity)
(Other definitions for prudence that I've seen before include "economy" , "Vigilance" , "Care and thought for the future" , "Caution; wisdom" , "Caution or shrewdness" .)