Related Clues:

• Potent drug
• Lethargy inducer
• Sedative drug
• Endorphin, e.g.
• Pull behind
• Something boring
• Drug that dulls the brain
• See 6 Across
• Drug from poppies
• Obstacle to progress
• Pull along the ground
• Word with race or queen
• Pull ... or puff
• Move with a mouse
• Poppy derivative