Office of Bishop managed church (6)
I believe the answer is:
branch
'office' is the definition.
(I've seen this before)
'bishop managed church' is the wordplay.
'bishop' becomes 'B' (chess abbreviation).
'managed' becomes 'ran' (I've seen this in another clue).
'church' becomes 'ch' (common abbreviation).
'b'+'ran'+'ch'='BRANCH'
'of' is the link.
(Other definitions for branch that I've seen before include "'Fork, offshoot (6)'" , "local office" , "Part of tree/river" , "division within large organisation" , "Offshoot, subsidiary part" .)