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Game up 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 understand how one could define the other.

I cannot understand how the rest of the clue works.

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(Other definitions for loophole that I've seen before include "way to escape penalty" , "opening" , "Ambiguity that makes it possible to evade an obligation" , "Escape clause" , "Ambiguity in the law" .)

I've seen this clue in The Sun.
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