Many will find this clue made from such rude bits! (4-6-5)

I believe the answer is:

four-letter-words

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'bits' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Maybe you can see an association between them that I don't see?

I can't explain the rest of the clue.

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I've seen this clue in The Irish Times.

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