A box of vital personal possessions (5)

I believe the answer is:

chest

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'a box' is the definition.
(chest is a kind of box)

I cannot understand how the remainder of the clue works.

(Other definitions for chest that I've seen before include "Trunk or crate" , "Strong box; thorax" , "Upper trunk" , "Part of body; storage box" , "Large box used for storage" .)

I've seen this clue in the Evening Standard.

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