Related Clues:

• Twice a century it starts to grow into a tree
• After a century, a tree comes to a finish of intelligence
• One C one C one A, all growing
• Twice with a hundred and one A grows up
• It takes at first a doubel century to grow this
• A blooming double century with a single A
• It grows for a century after a century to start with
• Two of a century with one of an A in the form of a tree
• After a century or two it turns up A-one as it grows up
• That blooming tree starts with a century at the double
• It takes a double century to start to get growing
• A CA is prickly over the CIA
• How an accountant grows to join American Intelligence
• 'Single C comes at the double, growing with single A (6)'
• An accountant over the blooming detectives