Crossword Genius

Unpleasant characters dismissing leader of harness racers (7)

Ross

I believe the answer is:

rotters

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'unpleasant characters' is the definition.
The definition and answer can be both people as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for rotters that I've seen is " Contemptible folk".)

I've seen this clue in The Independent.
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