Related Clues:

• Be compelled to
• Essential thing
• 'Something's -- Give'
• Has no choice
• Stevie Wonder's '___ Have You'
• Something vital
• Needs to
• Can't-miss event
• "__ Travel On": 1958 folk song
• Is obligated to
• "It's a __-see!": "Don't miss it!"
• ''__ run!''
• It's not an option
• Non-negotiable
• "__ go!"