Dead man's chest? (6)

I believe the answer is:

casket

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'chest?' is the definition.
(I have seen 'Small chest' mean 'casket' so perhaps 'chest' could also mean 'casket')

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

Can you help me to learn more?

(Other definitions for casket that I've seen before include "Small box to hold jewels" , "Coffin or jewellery box" , "Ornamental box" , "Box for jewellery, or corpse" , "Small box or chest" .)

I've seen this clue in The Sun and The Guardian.

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