What does the cryptic crossword clue "Bulb illuminated, one working (5)" mean?

The definition is "Bulb". The wordplay uses a charade (building blocks). ON (abbreviation of "illuminated,") + I (synonym of "one") + ON (synonym of "working"); definition: "Bulb" The answer is Onion.

Bulb illuminated, one working (5)

Telegraph Prize Cryptic #3104 | 27 Across | 2021-04-18 flower

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