Crossword puzzle clue "they're a part of every century"

They're a part of every century

"Republicans believe every day is the Fourth of July, but the Democrats believe every day is ___ 15" (Ronald Reagan)

He said "Every great film should seem new every time you see it"

One who knows every word on every album

Tournament in which every contestant plays against every other

"___ would be a serious felony since you'd have to take every prop and kidnap every actor"

What every other letter of every answer in this puzzle is

19th-century author who wrote "Vanity working on a weak head, produces every sort of mischief"