A bishop caught with horse outside church office (6)
I believe the answer is:
abbacy
'church office' is the definition.
'abbacy' can be an answer for 'office' (I have seen 'Religious office' mean 'abbacy' so perhaps 'office' could also mean 'abbacy'). I am not sure about the 'church' bit.
'a bishop caught with horse outside' is the wordplay.
'bishop' becomes 'B' (abbreviation for bishop in chess).
'caught with' becomes 'c' (cricket abbreviation. I am not sure about the 'with' bit.).
'horse' becomes 'bay' (bay is a kind of horse).
'outside' is an insertion indicator (some letters go outside others).
'c' inserted within 'bay' is 'bacy'.
'a'+'b'+'bacy'='ABBACY'
Can you help me to learn more?
(Other definitions for abbacy that I've seen before include "Office of head monk" , "Office of the head of a monastery" , "ecclesiastical office" , "Office of the head of a religious house" , "Office of a chief monk" .)