Crossword Genius

Keep shaking the cart (5)

Ross

I believe the answer is:

wagon

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for wagon that I've seen before include "On this, one keeps dry!" , "Railway freight vehicle" , "Wild West trail vehicle?" , "Transport" , "Van, lorry" .)

I've seen this clue in The Guardian and The Times.
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