Crossword Genius

Graeme is not a problem for a close group of three (6,1,5)

Ross

I believe the answer is:

menage a trois

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

'a close group of three' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'graeme is not a problem' is the wordplay.
'problem' indicates an anagram.
'graeme'+'is'+'not'+'a'='graemeisnota'
'graemeisnota' anagrammed gives 'MENAGE A TROIS'.

'for' is the link.

Can you help me to learn more?

(Other definitions for menage a trois that I've seen before include "third party involvement?" , "household of unusual size" , "Complicated household relationship (two + one)" , "triangular arrangement" , "complicated arrangement!" .)

I've seen this clue in the Sydney Morning Herald.
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