Crossword Genius

One of four on a British car (4)

Ross

I believe the answer is:

tyre

(Other definitions for tyre that I've seen before include "Rubber cushion round car wheel" , "Wheel's rubber tube" , "A spare one around the tummy is fat" , "subject to inflation" , "Something with a tread" .)

I've seen this clue in the LA Times.
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