Crossword Genius

Ballots prefer end advancing incumbent (9)

Ross

I believe the answer is:

referenda

I'm a little stuck... Click here to teach me more about this clue!

'ballots' is the definition.
The definition and answer can be both acts as well as being plural nouns.
Maybe they are linked in a way I don't understand?

'prefer end advancing incumbent' is the wordplay.
'REFERENDA' is hidden within the letters.
However, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for referenda that I've seen before include "decisions for people" , "National votes or plebiscites (9)" , "submissions to people" , "Votes put to country generally 9)" , "General votes" .)

I've seen this clue in the Sydney Morning Herald.
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