Historical clue formulations

• High nest: Var. — 2005-12-04
• Isolated nest: Var. — 2002-01-27
• High nest: Var. — 1999-06-01
• High nest: Var. — 1998-06-19
• Lofty nest: Var. — 1994-10-29
• Nest for 21-Down: Var. — 1994-06-07