Where account may be kept of politician's election slogan? (8,7)

I believe the answer is:

building society

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'where account may be kept of politician's election slogan?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

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(Other definitions for building society that I've seen before include "Financial institution" , "financial organisation" , "it's not a bank" .)

I've seen this clue in The Telegraph.

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