Cunning, cleverness (5)
I believe the answer is:
guile
This clue is a double definition.
'cunning' is the first definition.
(I know that cunning can be written as guile)
'cleverness' is the second definition.
(thesaurus)
(Other definitions for guile that I've seen before include "Cunning intelligence" , "Slyness" , "Crafty behaviour" , "Deceitful cunning" , "Artfulness, cunning" .)