Food communications that are unwanted (4)

I believe the answer is:

spam

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'food' is the definition.
(I know that Spam is a type of cold cut)

I can't explain the rest of the clue.

(Other definitions for spam that I've seen before include "Tinned processed meat" , "Unwanted e-mails" , "Uninvited email" , "Computer junk mail" , "(Send) junk mail" .)

I've seen this clue in The Times.

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