Absurdly rich parish starts to build other churches in York maybe (13)
I believe the answer is:
archbishopric
'york maybe' is the definition.
(an archbishopric is an area with an archbishop)
'absurdly rich parish starts to build other churches' is the wordplay.
'absurdly' indicates an anagram (I've seen this in other clues).
'starts to' says to take the initial letters.
The initial letters of 'build other churches' is 'boc'.
'rich'+'parish'+'boc'='richparishboc'
'richparishboc' with letters rearranged gives 'ARCHBISHOPRIC'.
'in' acts as a link.
(Other definitions for archbishopric that I've seen before include "See" , "Canterbury or York, for example" , "Senior church post" , "High church office" .)