1950s' countercultural figure (7)
I believe the answer is:
beatnik
(Other definitions for beatnik that I've seen before include "Social rebel of the 1950s" , "Disaffected 50s youth" , "Fifties rebel" , "Kite ban (anag) - 1950s' non-conformist" , "Young person of the 1950s, nonconformist in dress and behaviour" .)