Circle of friends (4)
'circle of friends' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for coterie that I've seen before include "Literary circle" , "EEC trio in exclusive group" , "Small exclusive group of people" , "Set" , "Exclusive social circle" .)
(Other definitions for gang that I've seen before include "Working group or mob of hoodlums" , "Criminals collectively" , "Band of delinquents" , "Criminal bunch" , "Criminal mob" .)