Possible Clues:

• What can go round, one way and another
• Spinning device that's no different in reverse
• What goes around, comes around, either way
• One goes round rubbish dumped on a hill
• Muscle seen from both sides
• __ cuff: shoulder muscles
• Two-way muscle
• Muscle that turns
• A muscle unaffected by being retracted
• Turner is rubbish at men