Possible Clues:

• This sucker will be a sucker
• Live on others' cake
• Cake cut out? Rubbish! It's located in 16 11
• It's used to clean bad smell in London area
• Aquatic creature,; cake
• Parasitic sort of 11?
• Cadge — porous object used for washing
• The sucker has gone after the ps is back
• Soak and clean with damp cloth
• Sea creature — cleanser — cake