Refine (4)
'refine' is the definition.
(hone can mean to refine or improve)
This is the entire clue.
(Other definitions for hone that I've seen before include "Sharpen tool on stone" , "Polish" , "Sharpen (a blade)" , "Strop" , "Smooth stone" .)
'refine' is the definition.
(I know that refine is a more specific form of purify)
This is the entire clue.
(Other definitions for purify that I've seen before include "Decontaminate" , "Clean" , "Remove contaminants from (something)" , "Remove contamination from" , "Cleanse" .)