Related Clues:

• Make a face, say
• Explain away
• Say you'll go, say
• Letters on an invite
• It may involve regrets
• Defend
• Letters before a phone no., perhaps
• Promise attendance, briefly
• Don't just show up
• It may be immune or conditioned
• Show otherwise
• Initials on invitations
• Short answer?
• Flinch, e.g.
• Prove to be false