Historical clue formulations

• Student's subspecialty — 2026-04-29
• Secondary subject for a college student — 2025-12-23
• Secondary area of study — 2025-06-03
• Of little consequence — 2023-08-09
• Small-time — 2022-10-28
• Not requiring much attention, say — 2021-09-24
• Not important — 2020-09-28
• Child, legally speaking — 2019-06-24
• ___ leagues — 2018-07-03
• No big deal — 2014-11-01
• Adult's counterpart — 2014-02-23
• One barred from bars — 2013-12-10
• Not serious — 2010-03-07
• 17-year-old, legally — 2009-07-20
• Hardly worth mentioning — 2008-10-31
• Teen, maybe — 2008-09-09
• Word with Asia or Ursa — 2008-07-07
• Petty — 2008-01-07
• Person under 21 — 2007-06-25
• Hardly worth mentioning — 2005-10-22
• Nondrinker by law — 2003-12-21
• Like some keys — 2002-01-25
• Dependent, often — 2001-09-12
• College student's declaration — 2000-10-08
• Hardly important — 1999-10-20
• Bush-league — 1998-05-20
• Like some keys — 1997-06-01
• Second-fiddle — 1997-03-30
• Not so important — 1996-08-25
• Student's declaration, maybe — 1995-06-11
• See 36-Across — 1995-04-20