What does the cryptic crossword clue "Out of the blue, but a red pencil is incorrect (13)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Out of the blue, but a red pencil is incorrect (13)

Telegraph Prize Cryptic #3261 | 9 Down | 2024-04-21 flower

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