Possible Clues:

• Metallic element from old show for old king shedding old city
• Metallic element, rather odd, gathering attention
• Metal bats rather grabbing attention
• There's an element such as yttrium? What a wonderful world!
• Such elements are rather confused
• Attention-grabbing rather unusual element such as promethium
• Element class including cerium
• Metal ground by two military groups
• Oxide, thin on the ground
• Little-known planet producing oxide