Crossword Genius

Which involves a trio of partners in crime? (6)

Ross

I believe the answer is:

bigamy

I believe this clue is a double definition.

'which involves a trio of partners' is the first definition.
(man with two wives)

'crime?' is the second definition.
(bigamy is a kind of crime)

'in' acts as a link.

(Other definitions for bigamy that I've seen before include "Crime involving marriage(s)" , "State of having two spouses at one time" , "Marital crime" , "crime, perhaps" , "Matrimonial crime" .)

I've seen this clue in The Times.
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