Witchcraft contemptible outside church (7)
I believe the answer is:
sorcery
'witchcraft' is the definition.
(I've seen this before)
'contemptible outside church' is the wordplay.
'contemptible' becomes 'sorry' (I am not sure about this - if you are sure you should believe this answer much more).
'outside' means one lot of letters goes inside another (some letters go outside others).
'church' becomes 'CE' (abbreviation for Church of England).
'sorry' going around 'ce' is 'SORCERY'.
Can you help me to learn more?
(Other definitions for sorcery that I've seen before include "practice being aligned with the devil?" , "Black magic" , "spells etc?" , "occultism" , "Use of magic" .)