Something hard for a butcher to use? (5)
I believe the answer is:
steel
'use?' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for steel that I've seen before include "Knife-sharpener" , "brace" , "Mixture of carbon and iron" , "Strength, determination" , "May be cold" .)