Vote for point supported by half of speeches (5)

I believe the answer is:

elect

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'vote for' is the definition.
(vote for in an election)

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

(Other definitions for elect that I've seen before include "Choose; singled out" , "Return" , "Put in power by voting" , "Opt for; chosen" , "Preferred" .)

I've seen this clue in The Guardian.

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