Crossword theme

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Across
  1. 3. Words read vertically.
  2. 5. Words read horizontally.
  3. 7. A game of words and clues.
  4. 9. The central idea connecting the entries.
  5. 10. The pattern of squares in a crossword.
Down
  1. 1. One who completes the challenges.
  2. 2. The correct response to a question.
  3. 4. Clever use of language in clues.
  4. 6. A hint to find the solution.
  5. 8. A single character in a word.