Possible Clues:

• Not making one's quota
• At the back of
• By the sound of it, be a dear and don't go out in front
• He reversed clamp around the bottom
• Rear end
• Rear — losing
• To blame for running late
• Be a deer, but not be four, by the sound of it
• Seat backing
• With 10- and 65-Across, 1971 hit by the Who