Possible Clues:

• Surgery, evidently reversible, seen in China
• Counterpart rings round very quietly
• Mate
• Mate getting into top position
• Workmate's potty, bouncing up and down
• Partner and antagonist with back-to-back theatre jobs
• Counterpart gets work one way and another
• 'Pees ’n ’ose', said mate
• Rival’s back-to-back works
• Pawnshop 'pottery pieces' are china