Much smashed to pieces in the underworld! (5)

I believe the answer is:

hades

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'underworld' is the definition.
(I know that underworld can be written as Hades)

I can't explain the remainder of the clue.

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(Other definitions for hades that I've seen before include "The underworld where the souls of the dead live" , "Greek underworld with spirits of the dead" , "It's hell in the Greek shade" , "Infernal situation" , "In Greek myth, the Underworld" .)

I've seen this clue in the Evening Standard.

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