Related Clues:

• With 85-Across, beachcomber's device
• Material used in 24-Across
• 21-Down, e.g.
• Type of detector
• "The ___ Purple" ('85 film)
• Heavy __ music
• 'Heavy' music genre
• It can be heavy or precious
• Carpet-buying decision
• Gold or lead
• A first principle, found in a kettle?
• Aluminium or copper for instance
• Constituent part
• Silver or gold, say
• Copper or silver, say