Related Clues:

• See 6 Across
• Obstacle to progress
• Pull along the ground
• Word with race or queen
• Pull ... or puff
• Move with a mouse
• Search a river-bed
• Main __
• Plane speed unit
• Smoker's puff
• Ratio of fast flight
• Concept in aerodynamics
• Pull from behind
• Strip opener
• Boring task