A Red-Brown Metal Used in Some Coins
Puzzle 13 of Countdown to 2020 Piece of Cake Pack
Question is: A Red-Brown Metal Used in Some Coins
and the answer is: COPPER
Word Meaning:
COPPER — (uncountable, chemistry) A reddish-brown metallic chemical element (symbol Cu) with the atomic number 29; also, the metal made up of this element.
Definitions from Wiktionary.