Possible Clues:

• Real party man, I worked in Westminster set-up maybe
• Change it: MP Angela Rayner at one working on private bills
• Mar a party line being awkward in governing body
• Legislative
• Standard complaint about one on a railway regarding diet?
• Standard of nutrition requiring demotion of lead item in diet
• Governmental
• and 18: Crushed men beam, particularly in Paris, finding way of governing Germany and others
• Relating to highest legislative body in Britain