Crossword Genius

I will leave Russian front (3)

Ross

I believe the answer is:

van

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'front' is the definition.
(I've seen this in other clues)

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

Can you help me to learn more?

(Other definitions for van that I've seen before include "Leading part" , "Leading point of army" , "Leading unit at the head of an army" , "Pantechnicon" , "Light lorry" .)

I've seen this clue in The Telegraph.
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