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Unemotional type of seafood snack (4,4)

Ross

I believe the answer is:

cold fish

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

'unemotional type of seafood' is the wordplay.
'unemotional' becomes 'cold' (I've seen this in another clue).
'type of seafood' becomes 'fish'.
'cold'+'fish'='COLD FISH'

Can you help me to learn more?

(Other definitions for cold fish that I've seen before include "Unemotional person of piscine sort" , "Unemotional person like chilled water animal" , "One showing no emotion" , "unfriendly type" , "Unpleasantly unemotional type" .)

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