Related Clues:

• Nickel or copper?
• Bit of hard cash?
• Say first
• Parking meter filler
• Invent a word
• Cupronickel creation
• Stuff in a mint
• Be the first to use
• Forging product
• Kind of detector
• Comfort zone
• Carbon or copper
• Create, as a phrase
• Dollar, maybe
• Hydrogen or helium