Historical clue formulations

• Hard to pin down — 2024-07-14
• Hard to pin down — 2018-08-16
• Slippery — 2017-06-03
• Slippery — 2012-09-27
• Hard to get — 2004-12-04
• Hard to grasp — 2004-11-17
• Slippery — 2001-01-20
• Hard to pin down — 2001-01-11
• Hard to describe — 1997-01-05
• Slippery — 1994-04-06