Crossword puzzle clue "there is an important one spelled out by the last characters of this puzzle's clues starting from the top"

There is an important one spelled out by the last characters of this puzzle's clues, starting from the top

Valley girl's "yeah, right" [IMPORTANT: SEE THE 'NOTE' (above) for key info about this week's puzzle and SEE THE LAST CLUE DOWN for the explanation of last week's puzzle.]

Inventor whose name is spelled out by the horizontal lines of special characters in this puzzle

Something taken out of the paper, and what's spelled out by the deleted letters in this puzzle's headlines

Period when one may make radical changes ... and a description of the radical change spelled out in this puzzle's theme

An apt one is spelled out by combining the first two letters of nine Across answers in this puzzle

Goes back to square one, and what's spelled out by certain letters in this puzzle

1935 poem with one word per line ... as spelled out by this puzzle's circled letters