Possible Clues:

• Some have punny names like "Slow Burn" or "Smells Like Teen Spirit"
• Neck's missing inner rings, and tapers
• They illuminate the prop of a 'Two Ronnies' sketch x 4
• Little light and all wicked
• Tree decorations also found in non-U things like this
• What the answers to the starred clues all have
• Tealights, for example
• Hanukkah lights
• Wicked group
• Menorah inserts