What does the cryptic crossword clue "Incorrect speed estimate is reckless (9)" 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.

Incorrect speed estimate is reckless (9)

Guardian Cryptic #27119 | 18 Across | 2017-02-13 flower

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