Aesop mixed up vegetable broth (3,4)

I believe the answer is:

pea soup

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'vegetable broth' is the definition.
'pea soup' can be an answer for 'broth' (I have seen 'Green broth' mean 'pea soup' so perhaps 'broth' could also mean 'pea soup'). I am not sure about the 'vegetable' bit.

'aesop mixed up' is the wordplay.
'mixed' indicates anagramming the letters.
'aesop' anagrammed gives 'peaso'.
'peaso'+'up'='PEA-SOUP'

Can you help me to learn more?

(Other definitions for pea soup that I've seen before include "dense fog" , "Thick vegetable broth" , "Liquid vegetable-based dish (like thick fog)" , "Green-coloured starter" , "Thick vegetable dish" .)

I've seen this clue in The Times.

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