What does the cryptic crossword clue "Tool that's pieced together (6)" 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.

Tool that's pieced together (6)

Telegraph #29881 | 15 Across | 2022-01-11 flower

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Telegraph Prize Cryptic #3217 (2023-06-18)