Accuse art of producing shelled sealife (9)

I believe the answer is:

crustacea

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'shelled sealife' is the definition.
I can't tell whether this definition defines the answer.

'accuse art of producing' is the wordplay.
'of producing' is an anagram indicator (I've seen 'producing' mean this).
'accuse'+'art'='accuseart'
'accuseart' with letters rearranged gives 'CRUSTACEA'.

Can you help me to learn more?

(Other definitions for crustacea that I've seen before include "Collection of hardbacks" , "class of seafood" , "shellfish" , "Shelled group" , "Prawns and lobster" .)

I've seen this clue in the Sydney Morning Herald.

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