Possible Clues:

• Alarm clock, e.g.
• One giving a wake-up call
• Party ousting leader with resistance may set alarm bells ringing
• Viagra? Run out? A drug taker to swallow it
• One who stimulates or evokes feelings or desires
• Alarm clock, e.g
• Reveille, e.g.
• Stimulating thing
• That which excites
• Interest-piquing thing