Crossword Genius

Cads head off harness racers (7)

Ross

I believe the answer is:

rotters

I'm a little stuck... Click here to teach me more about this clue!

'cads' is the definition.
(I've seen this in another clue)

I don't understand how the remainder 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 Sydney Morning Herald.
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