Crossword Genius

Double-Dutch criminal? (8)

Ross

I believe the answer is:

bigamist

'criminal?' is the definition.
(someone married to more than one person)

I cannot understand how the remainder of the clue works.

(Other definitions for bigamist that I've seen before include "Person who marries illegally - already wed (8)" , "Man with two wives" , "One marrying too often" , "member of two unions" , "lawbreaking union member" .)

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