The Clue When doubled, popular comic character
The Answer TIN
The answer "TIN" fits the crossword clue because when you double it, you get "TINTIN." Tintin is a very popular comic character created by Belgian cartoonist Hergé. He is known for his adventures as a young reporter traveling the world with his dog, Snowy. The clue cleverly plays on the idea of doubling the word "TIN" to reveal the character's name.