Clue: Carmen, amateur, useless (4)
Answer: RACA
Explanation: Definition: useless
RAC (Royal Automobile Club, so "car men") + A. This word (meaning "worthless", from Chaldean) appears once in the bible, in Matthew 5:22: "But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire." So, mind what you say to your brother…