Oversaw church and farm (5)
I believe the answer is:
ranch
'farm' is the definition.
(I know that ranch is a type of farm)
'oversaw church' is the wordplay.
'oversaw' becomes 'ran' (I've seen this in another clue).
'church' becomes 'ch' (common abbreviation).
'ran'+'ch'='RANCH'
'and' is the link.
(Other definitions for ranch that I've seen before include "US livestock farm" , "US establishment for livestock" , "tear for a poet" , "Agricultural establishment" , "Hacienda" .)