A dish incompetently made? (4)

I believe the answer is:

hash

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

I can't explain the rest of the clue.

(Other definitions for hash that I've seen before include "Stew - botched job" , "Mess; meat/potato dish" , "Stew - key" , "Meat dish or hallucinogen" , "Recycled food" .)

I've seen this clue in the Evening Standard.

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