Related Clues:

• Component - habitat
• Fire (or part of one)
• Material detectable in the ground
• Element eg for road or rail
• Element such as iron, copper, zinc etc
• Iron, for instance - part of an electric kettle
• Lead or iron, perhaps
• Basic chemical unit
• Basic substance or feature
• Primary chemical substance
• Fundamental part of whole
• Solid material, a good conductor of heat and electricity
• Ingredient — small amount
• Iron, gold or silver, for example
• Operative part of an electric kettle