Historical clue formulations

• Long-running hip-hop magazine, with "The" — 2023-11-14
• Journalist's secret — 2022-08-26
• Listing in a footnote — 2021-10-12
• Horse's mouth, so to speak — 2018-09-08
• Info provider — 2018-04-15
• One given a citation — 2017-03-05
• Reporter's contact — 2016-05-31
• Deep Throat, e.g. — 2006-03-05
• Reporter's need — 2002-05-18
• Reporter's need — 2002-02-17
• Informant — 2000-07-09
• Deep Throat, e.g., in the Watergate scandal — 1998-03-09
• Informant — 1995-10-14