Possible Clues:

• Twerp's geisha cast aside
• Ostensibly private aside intended to be heard by audience
• Dramatic confidence?
• Announcement intended for spectators but not players, supposedly
• Spare weights must be set aside
• In play, thesps earwig for something the audience should hear
• Pretend-quiet delivery
• Utterance by an actor, supposedly not heard by the other players
• Production line that's quietly effective?
• Pesters a Whig to change statement to the House