Body found in the motorists boot? (7)

I believe the answer is:

carcase

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'body' is the definition.
(I know that carcase is a type of body)

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

Can you help me to learn more?

(Other definitions for carcase that I've seen before include "Dead body of an animal" , "Body of dead meat" , "Corpse" , "Have his - (D L Sayers)" , "remains" .)

I've seen this clue in The Irish News.

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