Related Clues:

• Express discontent
• Sweat bullets
• Be a worrywart
• Fingerboard feature
• Guitarist's worry?
• Worrisome guitar part?
• Fingerboard ridge
• Stay awake nights
• Agonize
• Overdo the 'what if?'
• Ridge on a guitar neck
• Bite one's nails
• Worry excessively
• Guitar ridge
• Wring one's hands