What does the cryptic crossword clue "Part sung in key, another key briefly eclipsing it (9)" mean?

The definition is "Part sung". The wordplay uses a container (one word inside another). ALT (synonym="key on a computer keyboard") in CONTRO (synonym="CONTRO") = CONTRALTO; definition: "Part sung" The answer is CONTRALTO.

Part sung in key, another key briefly eclipsing it (9)

Guardian Cryptic #29044 | 6 Down | 2023-04-14 flower

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