Possible Clues:

• The sort of printing that confuses clients?
• Sounds as if it might be for holy writing
• Sounds as if it might be holy writ
• Sort of design clients ordered
• It is used for duplicating clients' letters
• Sounds as if it's wholly in writing
• Sort of printing gun - can it lose initially?
• Clients designed template
• Create design in a way that's upset clients
• Plastic through which to draw money by cents, I gathered