After the salmon she gets food poisoning (4)

I believe the answer is:

ella

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'poisoning' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?

I can't explain the rest of the clue.

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(Other definitions for ella that I've seen before include "Ms Fitzgerald" , "- - Fitzgerald (mus.)" , "Great late jazz singer . . . . Fitzgerald" , "---- Fitzgerald, 'Queen of Jazz'" , "Diminutive of Eleanor" .)

I've seen this clue in The Globe and Mail.

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