Famous metalworker and I put in small room with nickel (7)
I believe the answer is:
cellini
'famous metalworker' is the definition.
The definition suggests a singular noun which matches the answer.
'i put in small room with nickel' is the wordplay.
'put in' is an insertion indicator.
'small room' becomes 'cell' (eg a prison cell).
'with' is a charade indicator (letters next to each other).
'nickel' becomes 'Ni' (Ni is the chemical symbol for nickel).
'cell'+'ni'='cellni'
'i' inserted inside 'cellni' is 'CELLINI'.
'and' is the link.
Can you help me to learn more?
(Other definitions for cellini that I've seen before include "Benvenuto -, Sixteenth century Italian goldsmith, sculptor" , "Benvenuto -, It. C 16 goldsmith, sculptor" , "Italian artist" , "Benvenuto -, sixteenth century Italian goldsmith/sculptor" .)