ConfuseÂ—or what to do to four common phrases to form this puzzle's theme answers

Question:

Answer:

ADDLE

Length:

Similar Crossword Questions:

Upright, and what's been removed to form this puzzle's theme answers
Some film credits, and the idea behind the eight theme answers in this puzzle
Number of times this puzzle's theme word appears diagonally in the grid (to complete the puzzle, shade those words plus the Down answers that begin where they meet)
What the theme answers have in common
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Like the theme answers in this puzzle?
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Second letters of this puzzle's five theme answers (seen in order)
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Bit of footwear that appears at both ends of this puzzle's theme answers
Agent "embedded" in this puzzle's theme answers
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Numerator for this puzzle's theme answers