What does the cryptic crossword clue "Fire on plane when phosphorus leaks from unopened backpack (6)" mean?

The definition is "Fire". The wordplay uses a charade (building blocks). ACK (synonym="ACK") + ACK (synonym="ACK") = ACKACK; definition: "Fire on plane" The answer is ACKACK.

Fire on plane when phosphorus leaks from unopened backpack (6)

Independent Cryptic #11761 | 5 Across | 2024-06-20 flower

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