Crossword Genius

Such unions aren't recognised (8)

Ross

I believe the answer is:

bigamous

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

'such' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for bigamous that I've seen before include "Underground cemetery" , "not right to have such a marriage?" , "Legal description of a marriage to a person while legally married to another" , "Marrying twice illegally" , "Having another other half!" .)

I've seen this clue in The Globe and Mail.
Want a hint initially instead of a full solution? Install my app