What does the cryptic crossword clue "Essentially vocal void, national anthem (1,6)" mean?

The definition is "anthem". The wordplay uses a charade (building blocks). OCA (synonym="OCA") + NADA (synonym="nothing=") = OCANADA; definition: "national anthem" The answer is OCANADA.

Essentially vocal void, national anthem (1,6)

Guardian Cryptic #29397 | 17 Across | 2024-05-31 flower

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