What does the cryptic crossword clue "Order to have noticeable effect (4)" 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.

Order to have noticeable effect (4)

Telegraph #29871 | 20 Down | 2021-12-30 flower

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Telegraph Prize Cryptic #31109 (2025-12-13)