Crossword Genius

Sound replacement (7)

Ross

I believe the answer is:

dubbing

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'sound replacement' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

This is all the clue.

Can you help me to learn more?

(Another definition for dubbing that I've seen is " name-calling?".)

I've seen this clue in the Evening Standard.
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