What does the cryptic crossword clue "Prison disturbance (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.

Prison disturbance (4)

Telegraph #29798 | 12 Across | 2021-10-05 flower

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Also seen in

Guardian Cryptic #29849 (2025-11-11) Times Cryptic #28610 (2023-05-23) Daily Mail Cryptic #16709 (2021-11-17)