Crossword puzzle clue "source of the six longest across answers in this puzzle"

Source of the six longest Across answers in this puzzle

Gratuity included in the six longest Across answers

Field frequenter found in this puzzle's five longest Across answers

Legislation signed 6/22/1944 by FDR ... and, initially, what the nine longest across answers in this puzzle comprise

String of letters found in this puzzle's longest Across answers

Theme of this puzzle hidden in the seven other longest across answers

Anagrammatic intruders in this puzzle's longest Across answers

Metaphor for time ... and, when divided into three words, puzzle theme found in the four longest across answers