What does the cryptic crossword clue "Problem with one prisoner is point of no return (7)" mean?

The definition is "point of no return". The wordplay uses a charade (building blocks). RUB (synonym of "Problem") + I (synonym of "one") + CON (synonym of "prisoner"); definition: "point of no return" The answer is RUBICON.

Problem with one prisoner is point of no return (7)

Times Cryptic #29081 | 1 Across | 2024-11-22 flower

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