Crossword Genius

Vehicles honked, first travelling to the rear (5)

Ross

I believe the answer is:

tanks

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'vehicles' is the definition.
(tank is a kind of vehicle)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for tanks that I've seen before include "Bombs" , "Armed vehicles" , "Armored military vehicles" , "Armoured military vehicles" , "Reservoirs - military vehicles" .)

I've seen this clue in The Guardian.
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