What does the cryptic crossword clue "Mission one: punctual BBC debate (8,4)" mean?

The wordplay uses a charade (building blocks). QUEST (synonym="mission") + I (synonym="one") + ON (synonym="ON") + TIME (synonym="punctual") = QUESTIONTIME The answer is QUESTIONTIME.

Mission one: punctual BBC debate (8,4)

Guardian Cryptic #29287 | 18 Across | 2024-01-24 flower

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