Don has Charlie replacing loud electronic device (9)

I believe the answer is:

processor

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'don' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see a link between them that I don't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for processor that I've seen before include "See 25" , "computer unit" .)

I've seen this clue in The Telegraph.

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