Attacked outside by church worker (6)
I believe the answer is:
sexton
'church worker' is the definition.
(term for a church caretaker)
'attacked outside by' is the wordplay.
'attacked' becomes 'seton' (set on can mean to attack).
'outside' indicates putting letters inside.
'by' becomes 'x' (multiplication sign).
'seton' enclosing 'x' is 'SEXTON'.
(Other definitions for sexton that I've seen before include "One looks after church and churchyard" , "Church caretaker, gravedigger" , "Church officer who attends the clergy" , "Church official" , "Person who tends a church and churchyard" .)