Reduce in volume — nutcase plea (anag) (11)

I believe the answer is:

encapsulate

(Other definitions for encapsulate that I've seen before include "Epitomise" , "Put in a nutshell" , "Express concisely and succinctly" , "Abridge - sum up precisely" , "Peanut scale (anag) -- put in concise form" .)

I've seen this clue in The Guardian.

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