Possible Clues:

• Literary word for prayer
• O, I refuse, sir, to come back for prayer
• An archaic or literary prayer
• O, no, sir, it makes a prayer
• Prayer — O no sir! (anag)
• Earnest appeal
• Prayer to have old leader released from confinement
• 'O Lord, ascending' in touching prayer
• Poetic term for prayer
• Stars host introduction to solemn prayer