What does the cryptic crossword clue "Light mineral sat on by silly wizard (10)" mean?

The wordplay uses a charade (building blocks). DUMB (synonym="‘silly’") + LED (synonym="‘light’ emitting diode") + ORE (synonym="‘mineral’") = DUMBLEDORE The answer is DUMBLEDORE.

Light mineral sat on by silly wizard (10)

Guardian Cryptic #29484 | 1 Down | 2024-09-10 flower

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