Possible Clues:

• Ultimately exorbitant assistant to damned ambitious doctor
• Ringer of church bell
• The other heavyweight church assistant
• Lovemaking - just wait for it in church, by the sound of it
• It's heavy if you have to toll the bell if you're male
• Breeding not back in church?
• Person who tends to a churchyard and church
• Gravedigger, perhaps, humping huge weight
• Either male or female may carry considerable weight for the Church
• Employee of the Church Times involved in attack