Concerned about a clique (6)
I believe the answer is:
caring
'concerned' is the definition.
(thesaurus)
'about a clique' is the wordplay.
'about' becomes 'ca' (abbreviation for 'circa').
'a clique' becomes 'ring' (I've seen this in other clues).
'ca'+'ring'='CARING'
(Other definitions for caring that I've seen before include "Protective or concerned" , "Tender, warm" , "Kind, affectionate" , "Showing compassion" , "Minding" .)