Crossword Genius

Rear lights we hear (5)

Ross

I believe the answer is:

raise

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'rear' is the definition.
(I know that rear can be written as raise)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for raise that I've seen before include "cairn" , "Amplify" , "Increased earnings in America" , "Care for during childhood" , "Heighten" .)

I've seen this clue in The Globe and Mail.
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