Astute (6)
'astute' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for clever that I've seen before include "Smart, adroit" , "Quick to learn and understand" , "Deft, able, bright" , "Bright - ingenious" , "Quick at learning and understanding" .)
'astute' is the definition.
(I know that astute can be written as shrewd)
This is all the clue.
(Other definitions for shrewd that I've seen before include "sharp" , "worldly wise" , "Astute or crafty" , "... knowing" , "Canny and clever" .)