Go away like a trade vehicle? (6)

I believe the answer is:

vanish

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'go away' is the definition.
(vanishing is a kind of going away)

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

Can you help me to learn more?

(Other definitions for vanish that I've seen before include "Cease to exist" , "Evanesce" , "Disappear or fade from sight" , "Disappear (in a puff of smoke?)" , "Become invisible" .)

I've seen this clue in the Evening Standard.

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