Get tough (7)
'get tough' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for coarsen that I've seen before include "become inferior" , "Become rough or insensitive" , "Make rougher" , "Dull" , "Make more harsh" .)
'get tough' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for use force that I've seen before include "Employ compulsion" , "Employ coercion to cure foes" .)