Historical clue formulations

• Refuge — 2018-04-11
• It's got you covered — 2017-09-17
• Protect — 2011-09-04
• Lean-to, e.g. — 2006-12-12
• 5-Across, e.g. — 1998-05-08
• Harbor — 1996-12-15
• Quarters — 1996-10-05
• Protection — 1994-10-13