Possible Clues:

• The dust of the Dust Bowl
• Cover on the bed?
• Covers ring with one large layer of earth
• Labour embraces works producing fertile ground
• The best lubricant for a bed's surface
• Work involving operations in part of garden
• One responsible for The Field uses it to spoil play?
• Ground attack's concealed by work, like a Trojan
• Earthy substance is better than greasy one
• Work planting hops, avoiding hard earth