Head office exploiting position in Barbican perhaps (7,6)
I believe the answer is:
housing estate
'barbican perhaps' is the definition.
(the Barbican Estate is a London housing estate)
'head office exploiting position' is the wordplay.
'head office' becomes 'HO'.
'exploiting' becomes 'using' (I've seen this in another clue).
'position' becomes 'estate' (estate can mean someone's position in life).
'ho'+'using'+'estate'='HOUSING ESTATE'
'in' is the link.
(Other definitions for housing estate that I've seen before include "Large area of homes" , "Living area" .)