Crossword Genius

Bar or shaft on which a pair of wheels revolve (4)

Ross

I believe the answer is:

axle

(Other definitions for axle that I've seen before include "Metal pin on which wheel revolves" , "Spindle between wheels" , "Wheel-shaft" , "Shaft on which wheels rotate" , "Pin in revolver" .)

I've seen this clue in The Mirror.
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