The beastly code that allows ruthless competition (6,3)

I believe the answer is:

jungle law

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'allows ruthless competition' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'the beastly code' is the wordplay.
'the beastly' becomes 'jungle' (I can't explain this - if you can you should believe this answer much more).
'code' becomes 'law' (legal code).
'jungle'+'law'='JUNGLE LAW'

'that' is the link.

Can you help me to learn more?

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

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