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Are cold fish a nutritious nibble? (4)

Ross

I believe the answer is:

acai

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If this is the answer I cannot explain how the clue works.

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(Other definitions for acai that I've seen before include "fruit which is nutritious" , "South American food product" , "something nutritional to eat" , "South American palm tree" .)

I've seen this clue in The Sunday Times and The Times.
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