Crossword Genius

Game over with error and legal oversight (8)

Ross

I believe the answer is:

loophole

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'game' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for loophole that I've seen before include "Escape clause" , "Mistake in legislation" , "Exploited legal ambiguity" , "way to escape penalty" , "Means of evasion" .)

I've seen this clue in The Sun.
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