Son snubbed fish, going back for other seafood (7)

I believe the answer is:

scallop

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'seafood' is the definition.
(scallop is a kind of seafood)

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

(Other definitions for scallop that I've seen before include "one may be in one's shell" , "Bivalve mollusc with fan-shaped shell" , "Bivalve with radiating ridges on shell" , "Shellfish that's also plc" , "Marine bivalve" .)

I've seen this clue in The Independent.

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