Crossword Genius

Collides with a vehicle in front (4,4)

Ross

I believe the answer is:

rear ends

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'collides with' is the definition.
(rear-ending is a kind of colliding with)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for rear ends that I've seen is " Runs into".)

I've seen this clue in The Times.
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