One young guy coming in to copy enamelwork (9)
I believe the answer is:
cloisonne
'enamelwork' is the definition.
(I've seen this before)
'one young guy coming in to copy' is the wordplay.
'one' becomes 'i' (Roman numeral).
'young guy' becomes 'son' (I can't explain this - if you can you should believe this answer much more).
'coming in to' is an insertion indicator.
'copy' becomes 'clone' (cloning is a kind of copying).
'i'+'son'='ison'
'ison' inserted inside 'clone' is 'CLOISONNE'.
Can you help me to learn more?
(Other definitions for cloisonne that I've seen before include "enamelware" , "Sort of design" , "Enamel work" , "Panelled enamelwork" .)