Maoist youth argued about drive back (3,5)
I believe the answer is:
red guard
'maoist youth' is the definition.
(the Red Guards were a '60s Chinese youth group)
'argued about drive back' is the wordplay.
'about' is an anagram indicator.
'drive' becomes 'dr' (abbreviation used in road names).
'back' shows that the letters should be reversed in order.
'dr' written backwards gives 'rd'.
'argued' with letters rearranged gives 'redgua'.
'redgua'+'rd'='RED GUARD'
(Other definitions for red guard that I've seen before include "Radical youth" , "Mao's paramilitary students" , "Mao's young activists" , "militant youth" .)