Division of a larger organisation (6)
I believe the answer is:
branch
'division of a larger organisation' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for branch that I've seen before include "One shop of a chain" , "Trunk offshoot" , "regional office" , "Division of some larger organisation" , "Bough - offshoot - secondary office" .)