Related Clues:

• Private line
• Speaker's digression
• Thespian's whisper
• Remark to an audience
• Brief digresion
• In reserve, as money
• Line spoken to the audience
• Actor-to-audience comment
• Out of the mainstream
• It might start 'By the way ...'
• Tangential remark
• Coward's ''To Step ___''
• Word with ''step'' or ''set''
• Word following ''push'' or ''cast''
• Other characters don't hear it