Possible Clues:

• Part of inner tube, or of erstwhile umbrella?
• Part of digestive system upset by muesli - avoid seconds!
• Part of canal in ancient Troy, reportedly?
• Intestine region
• Food processor taking seconds off serving up breakfast cereal
• Posterior part of the small intestine
• Leading scientist withdraws from backing breakfast cereal as 'essential aid to digestion'
• Son being put off healthy cereal that's rejected in part of gut
• Lowest part of the small intestine, between the jejunum and the ileocaecal valve
• The part of the small intestine between the jejunum and the caecum