What does the cryptic crossword clue "Bulb working – something positive, possibly (5)" mean?

The definition is "Bulb". The wordplay uses a charade (building blocks). ON (synonym=""working"") + ION (synonym="a charged atom, so "something positive. possibly"") = ONION; definition: "Bulb" The answer is ONION.

Bulb working – something positive, possibly (5)

Guardian Cryptic #29232 | 6 Down | 2023-11-20 flower

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