Compassionate about a group (6)
I believe the answer is:
caring
'compassionate' is the definition.
('caring' can be similar in meaning to 'compassionate')
'about a group' is the wordplay.
'about' becomes 'c' (abbreviation for 'circa').
'group' becomes 'ring' (**).
'c'+'a'+'ring'='CARING'
(Other definitions for caring that I've seen before include "Compassionate" , "Feeling concern/interest" , "Kind, affectionate" , "Displaying kindness and concern for others" , "Feeling concern or interest" .)