Green fish-and-chips side dish (5,4)

I believe the answer is:

mushy peas

(Other definitions for mushy peas that I've seen before include "Green favourite up north" , "Accompaniment to fish?" , "Vegetable to go with fish and chips?" , "Processed vegetables" , "Squidgy green side dish served in a greasy spoon cafe" .)

I've seen this clue in the Newsday.

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