Shell of a crab or crayfish (8)

I believe the answer is:

carapace

(Other definitions for carapace that I've seen before include "soft top? Hardly" , "Bony covering on some animals" , "Hard shell of tortoise, crab etc" , "Hard thick shell of some creatures" , "Crab's thick protective shield" .)

I've seen this clue in The Wall Street Journal.

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