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Support the crook help with a stake (3,3,4)

Ross

I believe the answer is:

aid and abet

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'support the crook' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'help with a stake' is the wordplay.
'help' becomes 'aid' (synonyms).
'with' becomes 'and'.
'stake' becomes 'bet' (synonyms).
'aid'+'and'+'a'+'bet'='AID AND ABET'

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I've seen this clue in the Sydney Morning Herald.
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