Related Clues:

• Argon or arsenic
• Gold perhaps in natural environment
• Particular deal -- it collapsed
• Fellows in TV turning up to Palladium, perhaps
• Lead or lithium
• Particular Christmas film seen in Irish house
• Perhaps fire English workers allowed outside
• Nickel or neon
• He, say, last to move pieces in check
• Police group with an assignment
• Xenon or zirconium
• Constituent — habitat
• Particular detachment of troops
• Iron perhaps used for cores to help cements?
• Oxygen, for example, just a hint?