Possible Clues:

• Shelter companion who would exploit you?
• Raised part of foot receives cold sponge
• Bloodletting worm
• Blood-sucking creature
• Parasite runs through Cork church
• Shelter by church suits worm
• Runs through Cork church with freeloader
• It's a real sucker
• Sponger who was once a doctor
• The long fish gets a start up to the sucker