Exotic senoritas game for polyamorous arrangements (7,1,5)

I believe the answer is:

menages a trois

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'polyamorous arrangements' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'exotic senoritas game' is the wordplay.
'exotic' indicates anagramming the letters (an unusual form of the letters).
'senoritas'+'game'='senoritasgame'
'senoritasgame' with letters rearranged gives 'MENAGES A TROIS'.

'for' acts as a link.

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I've seen this clue in The Guardian.

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