Historical clue formulations

• Author known for the intelligence of his writing? — 2019-01-03
• John who wrote "A Perfect Spy" — 2015-06-15
• Smiley's creator — 2011-08-28
• Spy novelist John — 2005-07-04
• Author connected to this puzzle's theme — 2003-01-14
• "The Russia House" author — 1997-02-15
• "A Murder of Quality" author — 1996-08-04
• Smiley's creator — 1995-04-23
• "Tinker, Tailor, Soldier, Spy" author — 1994-11-25