Related Clues:

• Key holder
• ''__ the Rainbow''
• He played Lord Jim in 'Lord Jim'
• Band at a wedding
• '___ here!'
• Classroom challenge
• Belfry sound
• Bathtub residue
• Venue for Holyfield
• True-false, for one
• Across
• Not an actual alert
• ''Back to you''
• Pop quiz, e.g.
• See 19 Across