Historical clue formulations

• Skill sharpener — 2015-09-13
• Sharp fellow? — 2007-04-08
• One working on the cutting edge? — 2006-04-22
• One perfecting — 2002-11-23
• Sword sharpener — 1999-05-12
• Perfecter — 1998-05-14
• Practicer — 1994-07-09