Historical clue formulations

• Ever-changing — 2017-03-30
• Frequently changing — 2015-06-26
• With 69-Across, Longtime Penn State head coach * Versatile — 2010-02-04
• Changeable — 2008-06-28
• Able to change shape — 2006-07-09
• Malleable — 2005-11-13
• Changeable in shape — 1996-02-13
• Exceedingly variable — 1995-09-16