The bony structure that encloses and protects the lungs, heart, etc. (7)

I believe the answer is:

ribcage

(Other definitions for ribcage that I've seen before include "Frame round the chest" , "bony frame" , "Bone structure of chest wall" , "protects one's heart" , "(Bones in) chest wall" .)

I've seen this clue in The Independent.

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