Theme of this puzzle, seen seven times in the grid

Question:

Length:

Similar Crossword Questions:

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)
Puzzle theme which appears nine more times in the grid
First of a pair of letters swapped six times in this puzzle's theme entries
Word appearing eight times in this puzzle grid
Second of a pair of letters swapped six times in this puzzle's theme entries
Theme of this puzzle, whose members are hidden throughout the grid
Site associated with this puzzle's theme
Place for a FISH (which is a hint to this puzzle's theme)
Winter feature with a hint to today's puzzle theme
Alternative words used as alternatives for each other in this puzzle's theme answers
Bit of footwear that appears at both ends of this puzzle's theme answers
Alternate puzzle theme
What this puzzle's theme answers contain (if you look closely enough)
Buffoon in modern-day slang, and word hidden five times in this puzzle
Descriptive of this puzzle's grid
Decisive time (or theme of this puzzle)
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Legend born 4/24/1942 whose name's 9 letters are the only ones in this puzzle grid
Image this puzzle grid is supposed to suggest
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Things that are hard to walk on, and this puzzle's theme