Related Clues:

• Greenish blue coating on copper
• Green rust on copper
• It's up to the priest and the knight between them to do the spadework for the green
• The cleric and the knight come up to get around to dig till all is green
• It's up to the priest to do the spadework to get the knight back for the green
• Go back, Father, and dig the knight up till all is green
• Sounds like the green grease of the one that gave us 13 down (9)
• Diver's rig treated with bluish coating
• ... composer with old grey copper's coat
• Greenish-blue deposit on copper
• Green-blue deposit on copper
• Blue-green deposit on copper
• Greenish-blue coat on copper; composer has grey in France
• Drives rig dressed in a green coat
• Green deposit