Reportedly throw social class (5)
I believe the answer is:
caste
'social class' is the definition.
(caste is a kind of social class)
'reportedly throw' is the wordplay.
'reportedly' shows a homophone (sound like).
'throw' becomes 'cast' (cast is a kind of throw).
'cast' sounds like 'CASTE'.
(Other definitions for caste that I've seen before include "Group within society" , "Religious or social class" , "Level in society" , "Social class in India" , "Brahmans for instance" .)