Related Clues:

• Be worried
• Lose sleep, maybe
• It doesn't conceal much
• Worry unnecessarily
• Mandolin ridge
• Barely-there wear
• Worry (over)
• Worry nervously
• Spot for a barre chord
• Act like a worrywart
• Part of a fingerboard
• Bare wear
• Not rest easy
• Say 'What to do? What to do?,' e.g.
• Act a bit vexed