Social group cleric converted (6)
I believe the answer is:
circle
'social group' is the definition.
(circle is a kind of social group)
'cleric converted' is the wordplay.
'converted' indicates an anagram.
'cleric' is an anagram of 'CIRCLE'.
(Other definitions for circle that I've seen before include "Seats above theatre stalls" , "part of theatre" , "Ring-shaped figure" , "Group (of people); go round" , "See 1 down" .)