Crossword Genius

Vehicles crossing America in convoy (7)

Ross

I believe the answer is:

caravan

'convoy' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for caravan that I've seen before include "Group of desert voyagers" , "Group travelling together across a desert in single file" , "Camel train" , "Towed home" , "Trailer with living quarters" .)

I've seen this clue in The Guardian.
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