Thoracic case? (5)
I believe the answer is:
chest
'case?' is the definition.
(both are types of container)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for chest that I've seen before include "Strong box; thorax" , "drawers in it!" , "Part of body; storage box" , "Breast - case" , "Piece of furniture" .)