Possible Clues:

• "The African Queen" hanger-on
• Freeloader on the back foot over returning conservative
• Archaic word for physician
• Sucker of sorts
• Scrounger given shelter by church
• Little bloodsucker
• Little sucker
• Annelid used in hirudotherapy
• One used to bleed, caught in turn by stiletto
• Old doctor about to be taken in by flipping scoundrel