Ancient Roman battle vehicle (7)

I believe the answer is:

chariot

(Other definitions for chariot that I've seen before include "'Two-wheeled, horse-drawn vehicle (7)'" , "four-wheeled carriage?" , "Old vehicle (of fire?)" , "ride in carriage" , "American religious folksong 'Swing low, sweet ...'" .)

I've seen this clue in the Sydney Morning Herald.

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