Possible Clues:

• Runs through Cork with church bloodsucker
• Old physician given shelter by church
• Worm, caught in stiletto, turning
• Scoundrel, catching cold, turned into parasite
• Sucking parasite
• Sponger who was once a doctor
• Clinging type taking shelter with companion
• Cold fish served up with hot worm
• Old medicinal sucker
• Annelid worm, used in medicine of old