Laid-back pig makes plans (4)

I believe the answer is:

maps

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

I can't explain the rest of the clue.

(Other definitions for maps that I've seen before include "Diagrams of geographical areas" , "Charts" , "Plans" , "Plots" , "Books of maps" .)

I've seen this clue in The Guardian.

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