Creator holding a service outside church court (9)
I believe the answer is:
architect
'creator' is the definition.
(I know that architect subproperty of designed by)
'a service outside church court' is the wordplay.
'service' becomes 'rite' (a religious service).
'outside' means one lot of letters goes inside another.
'church' becomes 'ch' (common abbreviation).
'court' becomes 'ct' (abbreviation used in road names).
'rite' enclosing 'ch' is 'rchite'.
'a'+'rchite'+'ct'='ARCHITECT'
'holding' acts as a link.
(Other definitions for architect that I've seen before include "Building designer" , "Author" , "Designer of buildings" , "Perhaps Scott" , "Wren perhaps" .)