Crossword Genius

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

Ross

I believe the answer is:

referenda

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'voters' is the definition.
Although both the answer and definition are plural nouns, I can't see how they can define each other.

I don't understand the rest of the clue.

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(Other definitions for referenda that I've seen before include "General votes" , "National votes or plebiscites (9)" , "Votes put to country generally 9)" , "National ballots on specific issues" , "National polls as for amendments of constitution" .)

I've seen this clue in The Guardian.
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