Class answer good person in church (5)
I believe the answer is:
caste
'class' is the definition.
(type of social class)
'answer good person in church' is the wordplay.
'answer' becomes 'a' (abbreviation eg in Q and A).
'good person' becomes 'st' (saint).
'in' indicates putting letters inside.
'church' becomes 'CE' (Church of England).
'a'+'st'='ast'
'ast' put into 'ce' is 'CASTE'.
(Other definitions for caste that I've seen before include "Hindu determinant of status" , "Religious or social class" , "Division of Hindu society" , "Group within society" , "Hereditary social class among Hindus" .)