Crossword Genius

A member of many unions (10)

Ross

I believe the answer is:

polygamist

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

This clue could be a double definition.

'a member' is the first definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'of many unions' is the second definition.
The definition suggests a singular noun which matches the answer.

Can you help me to learn more?

(Other definitions for polygamist that I've seen before include "Great family man" , "not being single-minded" , "One multiply-spliced" , "One with multiple spouses" , "Person multiply married" .)

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