Grand things to win (5)

I believe the answer is:

slams

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'grand things' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Maybe there's an association between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for slams that I've seen is " Shuts loudly, violently".)

I've seen this clue in the Evening Standard.

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