What does the cryptic crossword clue "Promise to keep silent on most of official questions put to voters (9)" mean?

The wordplay uses a charade (building blocks). REFERE (synonym="REFERE") + NDA (synonym="non-disclosure agreement, a promise to keep silent") = REFERENDA The answer is REFERENDA.

Promise to keep silent on most of official questions put to voters (9)

Guardian Cryptic #29605 | 22 Across | 2025-01-30 flower

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