Picked at the polls (7)

I believe the answer is:

elected

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

'picked' is the definition.
(I've seen this in another clue)

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

(Other definitions for elected that I've seen before include "In a position" , "Appointed" , "made a choice" , "Chose by poll" , "Chosen by ballot" .)

I've seen this clue in the Evening Standard.

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