Possible Clues:

• Formal term for gullets
• What act as channels for processing sago, I hope!
• I go around a hospital to set up feeding tubes
• Tubes in good shape after surgery, having removed five hundred and one
• A ship, eg, circles different parts of our canals
• Fare goes down here, so I hope, when flying, to save a grand
• Gullets, in anatomy
• Tubes replacing spaghetti with hoops instead of squares