Crossword Genius

Unreal chef cooked something that's shouldn't exist! (1,4,5)

Ross

I believe the answer is:

a free lunch

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'something that's shouldn't exist' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'unreal chef cooked' is the wordplay.
'cooked' indicates an anagram (letters cooked into a new form).
'unreal'+'chef'='unrealchef'
'unrealchef' with letters rearranged gives 'A FREE LUNCH'.

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I've seen this clue in The Irish Times.
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