Possible Clues:

• Tinny crushing tall mice
• Student enthralled by changing climate of Mercury?
• Like iron, gold, etc
• Setter receiving great kick in the guts -- from copper?
• As copper, for example, call time after disturbance
• Irony of lake's contribution to climate change?
• Like iron or tin
• London police in charge, kettling everybody -- that's harsh
• Convened everyone in charge of copper, perhaps
• Mark (and others) on shortened beat of copper?