Hindu group (5)
I believe the answer is:
caste
'hindu group' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for caste that I've seen before include "Hindu determinant of status" , "Social class in Hinduism" , "Hereditary social class among Hindus" , "Social position" , "Brahmans for instance" .)