Church worker with grave responsibilities (6)
I believe the answer is:
sexton
'church worker' is the definition.
(term for a church caretaker)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for sexton that I've seen before include "Sacristan" , "They went and told the -, and / The - tolled the bell (Thomas Hood)" , "Person who tends a church and churchyard" , "Church officer who attends the clergy" , "One might dig" .)