What does the cryptic crossword clue "Prison island held by the French for endless sentence (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 island held by the French for endless sentence (4)

Independent Cryptic #12155 | 23 Down | 2025-09-23 flower

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