Related Clues:

• Reddish-brown colors
• Corrodes, as iron
• Oxidises
• Undergoes oxidation
• Shows its age, in a way
• Shows signs of neglect
• How iron corrodes
• Corrodes, as old bikes
• Yields to oxidation
• Picks up brown coat leader of hospital body’s dropped
• Gets creaky, say
• Ages from oxidation
• Loses sheen, perhaps