One dish that may be settled (4)

I believe the answer is:

hash

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'one dish' is the definition.
(hash is a kind of dish)

I cannot understand how the rest of the clue works.

(Other definitions for hash that I've seen before include "Mess; reheated meal" , "Minced meat and vegetables - a mess!" , "Meat dish; mess, jumble" , "dope" , "Recycled food" .)

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

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