Metal not worth much (6)
I believe the answer is:
nickel
'metal' is the definition.
(I know that nickel is a type of metal)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for nickel that I've seen before include "American 5-cent piece" , "One twentieth of a US dollar" , "very little money" , "Metallic element, Ni" , "Coin worth half a dime" .)