Historical clue formulations

• Left of center? — 2025-10-30
• City, but not county, leader? — 2017-04-02
• Circular opening? — 2015-02-01
• The fourth (but not the first) letter of "cancel" — 2014-06-23
• Cymbal sound — 2013-07-27
• The fourth letter of "cancel," but not the first — 2013-01-07
• Third of December? — 2010-09-01
• Ceylon's capital? — 2008-10-12
• The first letter of "circle" (but not the fourth) — 2008-09-16
• Centaur's head? — 2007-08-12
• Centipede's head? — 2005-04-28
• Head of circulation? — 2002-06-23
• Central opening? — 2000-01-05