Possible Clues:

• Response at the door
• Formal response to "Who goes there?"
• Formal "Who's there?" answer
• Dramatic response to 'Who's there?'
• Formal answer to 'Who's at the door?'
• 'Presenting...me!'
• Uppity answer to 'Who's there?'
• 'Who goes there?' comeback
• 'Who goes there?' reply
• Grammarian's reply to 'Who's there?'