What does the cryptic crossword clue "Pupil producing rubbish say in exercise (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.

Pupil producing rubbish say in exercise (7)

Telegraph Prize Cryptic #3262 | 28 Across | 2024-04-28 flower

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