New driver, usually (4)
I believe the answer is:
teen
'new driver 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 "Youngster of a certain age" , "Adolescent, then adult-to-be" , "Young person" , "Juvenile" , "Adolescent (informal)" .)