Possible Clues:

• Kind of seat used by 007
• In Paris, I fill in when Hector loses head with one of the removal guys
• Steam engine exhaust system
• Expulsive device
• One may be put out by this seat
• Thrower-out
• Something or someone that throws out
• Someone supplanting another
• Bouncer? Gets Conservative coming in to jeer thrown out
• Gun part which throws out empty shell cases after firing