His work involves grave responsibility (6)

I believe the answer is:

sexton

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'his work involves grave responsibility' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is all the clue.

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(Other definitions for sexton that I've seen before include "Person who tends a church and churchyard" , "Job" , "Church employee" , "Sacristan" , "Church worker" .)

I've seen this clue in The Globe and Mail.

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