Possible Clues:

• Passageway into a mine
• I'd turn in at the entrance
• Entrance for Clementine's dad
• Opening financial analysis ignored union leader
• Opening commercial with sex appeal
• Put it on, by the sound of it, into mine
• Using a key it follows there is an opening
• The way to get to mine is get Father back with it
• Notice vermouth in the passage
• Sounds as one might put it on the way into mine