Driver's ed student, usually (4)
I believe the answer is:
teen
'driver's ed student usually' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for teen that I've seen before include "Adolescent (informal)" , "Juvenile" , "Adolescent, then adult-to-be" , "Of 13 to 19 year olds" , "Youngster over twelve" .)