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What Marks and Spencer did when they got together? (6,4)

Ross

I believe the answer is:

talked shop

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'got together?' is the definition.
The answer and definition can be both to do with communicating as well as being past participle verbs.
Perhaps you can see an association between them that I can't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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