Possible Clues:

• Protect
• A world ruler is its rocker
• Baby's bed, especially one that can be rocked
• 'When the bough breaks, the . . . . . . will fall'
• 'The hand that rocks the .... rules the world'
• Hold gently
• The hand that rocks it rules the world, they say
• One for rocking baby
• Nursery item
• Artist in recording only half able to be a rocker?