Related Clues:

• Tough to figure out
• Cryptic, mysterious
• Puzzling, obscure
• Mysterious like Mona Lisa's smile
• Mysterious or puzzling
• Concealing meaning in puzzling way as Crosaire does
• Mysterious or puzzling, like Mona Lisa's smile
• Mysterious, puzzling
• 'Obscure, puzzling (7)'
• Under the church, I see, you'll find crosaire for one
• Crosaire makes a grave sort of crossword, I see
• It's a mystery what is the magnet ICI has
• The magic I met is so puzzling
• Bury Crosaire down there, I see
• The last place you'd find Crosaire, I see