FBI agents in clique creating division (7)
I believe the answer is:
segment
'division' is the definition.
(I've seen this in another clue)
'fbi agents in clique' is the wordplay.
'fbi agents' becomes 'g-men' ('G-man' can be a synonym of 'fbi agent').
'in' indicates putting letters inside.
'clique' becomes 'set' (a clique is a social set).
'gmen' inserted inside 'set' is 'SEGMENT'.
'creating' acts as a link.
(Other definitions for segment that I've seen before include "(Divided-up) part" , "Division" , "Piece of an orange" , "Part separable from other parts, say of orange" , "Portion" .)