Proverb giving a clue to this puzzle - Answers with 21 Letters

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Similar Crossword Questions:

Dictionary source for each asterisked clue in this puzzle
Like each answer in this puzzle - also each word in each clue - in length
State after being coldcocked (and a clue to this puzzle's theme)
Diving rotation, and the clue for four puzzle answers
School phrase with a clue to this puzzle's theme
Some sewing machines (and clue to this puzzle's theme)
Clue for the four longest answers in this puzzle
Heavy brew, and a clue to this puzzle's theme
"That's my cue!" (fun fact: I inadvertently stole this clue from my own NYT puzzle)
Clue to this puzzle's theme
Start of a proverb about consequences ... and a hint to this puzzle's theme
Name that would be super easy to clue if this puzzle were in Korean
Kind of secret represented by each two-letter puzzle clue?
"___ is completely over" (baffling statement made by Prince on 7/5/10 that also serves as a clue how to find four answers in this puzzle)
"Forget it!" (and a clue to this puzzle's theme)
Job title (giving a hint to this puzzle's theme)
Home-field advantage in football ... or what the last square of the answer to this clue represents in this puzzle
Many a puzzle clue ending in "?"
Big fight, and clue to this puzzle's theme that begins the four longest answers
Viper, and a clue to this puzzle's theme
Article in a German paper?[For the explanation to last week's puzzle, see the last clue down.]
TV feature, and a clue to six other answers in this puzzle
Intrepid [Editor's note: This clue appears in heavier type (without the asterisks) in the print version of the puzzle. AcrossLite can't handle that, so just imaging that it's written in darker type.]
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.]
Spin, as a cue ball, and how to answer each starred clue in this puzzle?