Seafood sorbet whipped up with a cry (6,4)

I believe the answer is:

oyster crab

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'seafood' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'sorbet whipped up with a cry' is the wordplay.
'whipped up with' indicates anagramming the letters.
'a'+'cry'='acry'
'sorbet' mixed up with 'acry' can make 'OYSTER CRAB'.

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