Related Clues:

• Knocker's identifying words
• Classic hit that begins 'My friends feel it's their appointed duty ...'
• Unhelpful reply to 'Who's this?'
• Clarification about an unrecognizable self-portrait
• 'I can help!'
• "I'd love to help"
• Unhelpful response to "Who's there?"
• 'It's not you, ___'
• 'I'm downstairs,' to a friend living in a high-rise apartment
• ''I want to get in the game!''
• Part of a classic breakup line
• “Psst! I’m in disguise!”
• Volunteer’s request
• “I live to serve”
• Response from a knocker