Sharpening wheel (10)
I believe the answer is:
grindstone
'sharpening wheel' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for grindstone that I've seen before include "nosing here?" , "sort of disc" , "hard work" , "Blade sharpener" , "Disc for sharpening knives" .)