Crossword Genius

Extra obstacle for motorists is betrayal (6-8)

Ross

I believe the answer is:

double-crossing

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'betrayal' is the definition.
(I know that double-crossing is a type of betrayal)

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

Can you help me to learn more?

(Another definition for double-crossing that I've seen is " cheating".)

I've seen this clue in The Guardian.
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