Related Clues:

• Holder of 11s and cause of 7 in 1549
• Worshipper's manual
• Manual of devotions
• Philosopher involved in publicity work for the liturgy
• Pages bound to be available at people's service?
• Comic opera by Lehar's ending fair - one opened by vicar?
• 19-Across et al
• It's bound to be of use to a churchgoer