Crossword Genius

Male swimmers are illegal native bird traders (6-9)

Ross

I believe the answer is:

budgie-smugglers

I'm a little stuck... Click here to teach me more about this clue!

'male swimmers are illegal native' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'bird traders' is the wordplay.
I cannot really see how this works, but
'bird' could be 'budgie' (budgie is a kind of bird) and 'budgie' is located in the answer.
The remaining letters 'smugglers' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

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