Possible Clues:

• Sediment particles
• Wine or coffee residue
• Doctor's holding for example, remains
• Leftovers
• Medic, say, beginning to sift remains of drink
• Sediment (in drink)
• Decanter residue
• Most worthless part (of anything)
• Stuff settled at the bottom of a drink
• What's left for director at Reginald's