Crossword Genius

The spiked disc of a spur (5)

Ross

I believe the answer is:

rowel

(Other definitions for rowel that I've seen before include "Spiked wheel on spur" , "Lower into a spur disc" , "Spur's spiked wheel" , "Spur's spiked disc" , "sort of wheel" .)

I've seen this clue in The Guardian.
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