Bills prepared for posting (8)

I believe the answer is:

placards

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'bills' is the definition.
(I know this)

I can't explain the remainder of the clue.

(Other definitions for placards that I've seen before include "Stiff cards bearing notices for display" , "Posters or notices for display" , "publicity" , "Stiff cards carried or displayed in public" .)

I've seen this clue in The Globe and Mail.

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