Typical high schooler (4)
I believe the answer is:
teen
'typical high schooler' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for teen that I've seen before include "Youth" , "Youngster of a certain age" , "Of 13 to 19 year olds" , "Youngster over twelve" , "Adolescent (informal)" .)