Crossword Genius

Would Cockney one get double Dutch? (8)

Ross

I believe the answer is:

bigamist

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'double dutch?' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for bigamist that I've seen before include "Law-breaker with more than one spouse" , "Person who marries while still married to another" , "One marries while already legally married to another" , "One who marries more than once illegally" , "One who unlawfully marries a second wife" .)

I've seen this clue in The Sun.
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