Pepper grinder (4)
'pepper grinder' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mill that I've seen before include "Flour factory" , "Building in which grain is ground to flour" , "Plant with facilities for manufacturing" , "Building for grinding corn into flour" , "Rob < works" .)
(Other definitions for molar that I've seen before include "of ivory, perhaps" , "Chewer and grinder" , "Grinding tooth in the back of a mammal's mouth" , "part of the daily grind" , "that could be capped" .)