What does the cryptic crossword clue "29s from first principles, as on the 17 (7)" 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.

29s from first principles, as on the 17 (7)

Guardian Cryptic #29933 | 14 Across | 2026-02-18 flower

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