What does the cryptic crossword clue "Test changed as you were reading proofs (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.

Test changed as you were reading proofs (4)

Telegraph Prize Cryptic #3255 | 22 Across | 2024-03-10 flower

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