One on a roll. Five to return? (5)

I believe the answer is:

voter

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'one on a roll' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

(Other definitions for voter that I've seen before include "One of the selectors" , "Member of electorate" , "one making sign of the cross" , "supporter of politician" , "Lively dances (esp. Irish)" .)

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

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