101 reading about Latin and English group (6)
I believe the answer is:
circle
'group' is the definition.
(I know that circle is a type of social group)
'101 reading about latin and english' is the wordplay.
'r0r' becomes 'CI' (roman numerals).
'reading about' becomes 'rc' (I am not sure about this - if you are sure you should believe this answer much more).
'latin' becomes 'l'.
'and' is a charade indicator (letters next to each other).
'english' becomes 'E' (abbreviation as in OED).
'ci'+'rc'+'l'+'e'='CIRCLE'
Can you help me to learn more?
(Other definitions for circle that I've seen before include "Draw line around (something)" , "Perfectly round plane figure" , "Perfect round" , "Curved figure" , "Closed plane curve" .)