Crossword Genius

How massage therapists socialised? (6,9)

Ross

I believe the answer is:

rubbed shoulders

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

'therapists socialised?' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'how massage' is the wordplay.
I cannot really see how this works, but
'massage' could be 'rub' (rub can mean to massage) and 'rub' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

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