Class from Lancaster (5)
I believe the answer is:
caste
'class' is the definition.
(type of social class)
'from lancaster' is the wordplay.
'from' says the answer is hidden in the clue.
'CASTE' is hidden within 'lancaster'.
(Other definitions for caste that I've seen before include "Social status" , "Religious or social class" , "Social class in India" , "Social group in India" , "Hereditary Hindu social division" .)