Historical clue formulations

• Feed a line to again — 2014-08-28
• Signal again, as an actor — 2013-05-27
• Prompt again — 2013-01-27
• Feed the same line — 2012-12-17
• Idée ___ (accepted idea, in French) — 2007-03-18
• Help a forgetful actor — 1999-10-24