Related Clues:

• Trunk item ... or what has been put on 18-, 24-, 41- and 53-Across?
• Likely result of excess 17- and 53-Across
• Middle weight
• Little extra poundage
• Road safety item
• Donut ... or the consequence of eating too many of them?
• Flat out?
• Emergency item in a trunk (2 words)
• Attachment on the back of a Jeep